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[4] alert, brainy, bright, brilliant, clever, intelligent, nimble, quick, quick-witted, sharp, smart—more at INTELLIGENT

[5] acute, delicate, perceptive, sensitive, sharp, strong—more at ACUTE

2keen noun : a lamentation for the dead uttered in a loud wailing voice or in a wordless cry

Synonyms

groan, howl, lament, moan, plaint, wail—more at LAMENT

3keen verb 1 : to lament with a keen

2 : to make a sound suggestive of a keen

Synonyms

bay, howl, wail, yowl—more at HOWL

keen·ness noun : the quality or state of being keen

Synonyms

appetite, ardor, avidity, eagerness, enthusiasm, excitement, hunger, impatience, thirst—more at EAGERNESS

1keep verb kept ; keep·ing 1 : to be faithful to esp. by appropriate conduct : FULFILL, OBSERVE <~ a promise> <~ a holiday>

2 : GUARD <~ us from harm>; also : to take care of <~ a neighbor's children>

3 : MAINTAIN <~ silence>

4 : to have in one's service or at one's disposal <~ a horse>

5 : to preserve a record in <~ a diary>

6 : to have in stock for sale

7 : to retain in one's possession <~ what you find>

8 : to carry on (as a business) : CONDUCT

9 : HOLD, DETAIN <~ him in jail>

10 : to refrain from revealing <~ a secret>

11 : to continue in good condition

12 : to resist an impulse or desire : ABSTAIN, REFRAIN

Synonyms

[1] answer, comply, fill, fulfill, meet, redeem, satisfy—more at FULFILL

[1] celebrate, commemorate, observe; also bless, consecrate, sanctify, solemnize; honor, laud, praise; obey, respect, revere, reverence, venerate; remember

Antonyms

break, transgress, violate

[7] hang on, hold, reserve, retain, withhold; also conserve, preserve, save; enjoy, have, own, possess; conduct, control, detain, direct; bear, harbor

Antonyms

hand over, relinquish, surrender

usually keep from [12] abstain, forbear, forgo, refrain—more at FORBEAR

2keep noun 1 : FORTRESS

2 : the means or provisions by which one is kept

— for keeps

1 : with the provision that one keep what one has won

2 : PERMANENTLY

keep–away noun : a game in which players try to keep an object from one or more other players

keep·er noun : one that keeps; especially : one who cares for another or another's property

Synonyms

custodian, guard, guardian, lookout, picket, sentry, warden, warder, watch, watchman—more at GUARD

caretaker, custodian, guardian, janitor, warden, watchman—more at CUSTODIAN

keep·ing noun 1 : CONFORMITY

2 : the act of one that keeps : the care, possession, or observance of something

Synonyms

care, custody, guardianship, safekeeping, trust, ward—more at CUSTODY

control, hands, possession—more at POSSESSION

keeping room noun : a common room used for multiple purposes

keep·sake noun : something kept or given to be kept as a memento

Synonyms

memento, memorial, monument, remembrance, souvenir, token—more at MEMORIAL

keep up verb 1 : to persist or persevere in

2 : to keep in an existing state : MAINTAIN

3 : to keep informed

4 : to continue without interruption

Synonyms

[1, 4] abide, continue, endure, hold, last, persist, run on—more at CONTINUE

[2] conserve, maintain, preserve, save—more at MAINTAIN

keg noun : a small cask or barrel

Synonyms

barrel, cask, hogshead, pipe, puncheon—more at CASK

keg·ger noun : a party featuring one or more kegs of beer

keg·ler noun : 1BOWLER

kelp noun : any of various coarse brown seaweeds; also : a mass of these or their ashes often used as fertilizer

kel·vin noun : a unit of temperature equal to 1/273.16 of the Kelvin scale temperature of the triple point of water and equal to the Celsius degree

Kelvin adjective : relating to, conforming to, or being a temperature scale according to which absolute zero is 0 K, the equivalent of −273.15°C

ken noun 1 : range of vision : SIGHT

2 : range of understanding

ken·nel noun : a shelter for a dog or cat; also : an establishment