Meaning: A tuft of grass or vegetation.

Part of speech: noun

Example: The rabbit hid in the tussock.

Category: Nature › Plants

Synonyms: tuft

Meaning: A small, thin branch of a tree or bush.

Part of speech: noun

Example: The twig snapped under his weight.

Category: Nature

Synonyms:

• branch
• stick

Meaning: The time of day just before it gets dark.

Part of speech: noun

Example: We went for a walk during twilight.

Category: Nature

Synonyms:

• dusk
• evening

Antonyms: dawn

Meaning: Dimly lit, as during twilight.

Part of speech: adjective

Example: The twilit room had a mysterious atmosphere.

Category: Nature

Synonyms:

• dim
• gloomy

Antonyms: bright

Meaning: To shine with a flickering light.

Part of speech: verb

Example: The stars twinkle in the night sky.

Category: Nature

Synonyms:

• sparkle
• glimmer

Antonyms: dull

Meaning: Shining with a flickering light.

Part of speech: adjective

Example: The twinkling lights created a festive atmosphere.

Category: Nature

Synonyms:

• sparkling
• glimmering

Antonyms: dull

Meaning: A tornado or a strong whirlwind.

Part of speech: noun

Example: The twister caused significant damage to the town.

Category: Nature › Weather

Synonyms:

• tornado
• whirlwind

Meaning: A tropical storm in the region of the Indian or western Pacific oceans.

Part of speech: noun

Example: The typhoon caused significant damage to the coastal towns.

Category: Nature › Weather

Synonyms:

• hurricane
• cyclone

Meaning: the part of a female cow that produces milk

Part of speech: noun

Example: The farmer checked the cow's udder for any signs of infection.

Category: Nature › Animal Anatomy

Meaning: Not looked after or tended to.

Part of speech: adjective

Example: The garden was uncared for.

Category: Nature

Synonyms:

• neglected
• untended

Antonyms:

• cared for
• tended

Meaning: Not changing; remaining constant.

Part of speech: adjective

Example: The unchanging landscape was beautiful.

Category: Nature

Synonyms:

• constant
• stable

Antonyms:

• changing
• variable

Meaning: Not crowded; having plenty of space.

Part of speech: adjective

Example: The park was uncrowded on a weekday.

Category: Nature

Synonyms:

• spacious
• roomy

Antonyms:

• crowded
• packed

Meaning: Not developed or improved; wild.

Part of speech: adjective

Example: The uncultivated land was overgrown with weeds.

Category: Nature

Synonyms:

• wild
• untamed

Antonyms:

• cultivated
• developed

Meaning: The area beneath the surface of the earth.

Part of speech: noun

Example: The underground is home to many unique species.

Category: Nature

Synonyms: subterranean

Meaning: Vegetation that grows beneath the canopy of trees.

Part of speech: noun

Example: The under growth in the forest is rich with wildlife.

Category: Nature

Synonyms: undergrowth

Meaning: Low-growing plants and shrubs in a forest.

Part of speech: noun

Example: The deer hid in the underbrush.

Category: Nature

Synonyms:

• undergrowth
• brush

Meaning: A current of water below the surface that moves in the opposite direction to the surface current.

Part of speech: noun

Example: The undertow can be dangerous for swimmers.

Category: Nature › Oceanography

Synonyms: current

Meaning: Located or occurring beneath the surface of water.

Part of speech: adjective

Example: The underwater landscape is full of colorful fish.

Category: Nature › Marine Biology

Synonyms: submerged

Meaning: Not disturbed or interrupted.

Part of speech: adjective

Example: The forest remained undisturbed by human activity.

Category: Nature

Synonyms:

• calm
• peaceful

Meaning: To move in a wave-like motion.

Part of speech: verb

Example: The flag began to undulate in the breeze.

Category: Nature

Synonyms:

• wave
• sway

Meaning: A wave-like motion or form.

Part of speech: noun

Example: The undulation of the hills was beautiful.

Category: Nature

Synonyms:

• wave
• oscillation

Meaning: not enclosed by a fence.

Part of speech: adjective

Example: The unfenced area was open to wildlife.

Category: Nature

Synonyms:

• open
• unprotected

Antonyms:

• fenced
• enclosed

Meaning: to open or spread out from a folded state.

Part of speech: verb

Example: The flowers began to unfold in the sunlight.

Category: Nature

Synonyms:

• open
• expand

Antonyms:

• fold
• close

Meaning: a hoofed mammal, such as a horse or cow.

Part of speech: noun

Example: Horses are a type of ungulate.

Category: Nature › Zoology

Synonyms:

• hoofed animal
• quadruped

Meaning: Not suitable for living in.

Part of speech: adjective

Example: The area was declared uninhabitable after the disaster.

Category: Nature › Environment

Synonyms: unlivable

Antonyms: habitable

Meaning: Not occupied by people.

Part of speech: adjective

Example: The island is uninhabited and full of wildlife.

Category: Nature › Geography

Synonyms: deserted

Antonyms: inhabited

Meaning: Not appealing or welcoming.

Part of speech: adjective

Example: The weather was uninviting for a picnic.

Category: Nature

Synonyms: unappealing

Antonyms: inviting

Meaning: to release or set free.

Part of speech: verb

Example: The storm unleashed its fury on the town.

Category: Nature

Synonyms:

• release
• let loose

Antonyms:

• restrain
• control

Meaning: not disturbed or interfered with.

Part of speech: adjective

Example: The wildlife remained unmolested in the protected area.

Category: Nature

Synonyms:

• untouched
• unbothered

Antonyms:

• molested
• disturbed

Meaning: not natural; artificial or forced.

Part of speech: adjective

Example: The colors in the painting looked unnatural.

Category: Nature

Synonyms:

• artificial
• forced

Antonyms:

• natural
• genuine

Meaning: not contaminated; clean and pure.

Part of speech: adjective

Example: The unpolluted river was a great spot for fishing.

Category: Nature

Synonyms:

• clean
• pure

Antonyms:

• polluted
• contaminated

Meaning: Not able to be predicted or foreseen.

Part of speech: adjective

Example: The weather is often unpredictable in spring.

Category: Nature › Weather

Synonyms:

• erratic
• unforeseeable

Antonyms:

• predictable
• stable

Meaning: Not shielded or defended from harm.

Part of speech: adjective

Example: The area remains unprotected from natural disasters.

Category: Nature › Safety

Synonyms:

• vulnerable
• exposed

Antonyms:

• protected
• sheltered

Meaning: Not calm or peaceful; restless.

Part of speech: adjective

Example: The unquiet sea made sailing difficult.

Category: Nature › Weather

Synonyms:

• restless
• agitated

Antonyms:

• calm
• peaceful

Meaning: Not yielding in strength or severity; persistent.

Part of speech: adjective

Example: The unrelenting heat made it hard to work.

Category: Nature › Weather

Synonyms:

• persistent
• unwavering

Antonyms:

• yielding
• relenting

Meaning: Not stopping or slowing down; persistent.

Part of speech: adjective

Example: The unremitting rain caused flooding.

Category: Nature › Weather

Synonyms:

• relentless
• constant

Antonyms:

• intermittent
• occasional

Meaning: Not fully developed or matured; immature.

Part of speech: adjective

Example: The unripe fruit was too sour to eat.

Category: Nature › Agriculture

Synonyms:

• immature
• green

Antonyms:

• ripe
• mature

Meaning: To remove a saddle from a horse.

Part of speech: verb

Example: He will unsaddle the horse after the ride.

Category: Nature › Animals

Synonyms:

• remove saddle
• take off saddle

Meaning: not appropriate for the season

Part of speech: adjective

Example: The unseasonable weather surprised everyone in the summer.

Category: Nature

Synonyms:

• inappropriate
• unexpected

Antonyms:

• seasonable
• timely

Meaning: not typical for a particular season

Part of speech: adjective

Example: The unseasonal rain caused flooding in the area.

Category: Nature

Synonyms:

• atypical
• irregular

Antonyms:

• seasonal
• typical