Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb perk_up

2 senses of perk up

Sense 1
perk up, perk, percolate, pick up, gain vigor -- (gain or regain energy; "I picked up after a nap")
       => recuperate, recover, convalesce -- (get over an illness or shock; "The patient is recuperating")

Sense 2
stimulate, arouse, brace, energize, energise, perk up -- (cause to be alert and energetic; "Coffee and tea stimulate me"; "This herbal infusion doesn't stimulate")
       => affect -- (act physically on; have an effect upon; "the medicine affects my heart rate")

Antonyms of adj perked_up

1 sense of perked up

Sense 1
perked up -- (made or become more cheerful or lively; "his attention made her feel all perked up")

INDIRECT (VIA enlivened) -> unenlivened -- (not made lively or brightened; "a life unenlivened by romance")

Similarity of adj perked_up

1 sense of perked up

Sense 1
perked up -- (made or become more cheerful or lively; "his attention made her feel all perked up")
       => enlivened (vs. unenlivened) -- (made sprightly or cheerful)