Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb button-up

1 sense of button up

Sense 1
close up, clam up, dummy up, shut up, belt up, button up, be quiet, keep mum -- (refuse to talk or stop talking; fall silent; "The children shut up when their father approached")

Antonyms of adj buttoned-up

2 senses of buttoned-up

Sense 1
buttoned-up -- ((British colloquial) not inclined to conversation)

INDIRECT (VIA taciturn) -> voluble -- (marked by a ready flow of speech; "she is an extremely voluble young woman who engages in soliloquies not conversations")

Sense 2
buttoned-up -- (conservative in professional manner; "employers are looking for buttoned-up types")

INDIRECT (VIA conservative) -> liberal -- (tolerant of change; not bound by authoritarianism, orthodoxy, or tradition)

Similarity of adj buttoned-up

2 senses of buttoned-up

Sense 1
buttoned-up -- ((British colloquial) not inclined to conversation)
       => taciturn (vs. voluble) -- (habitually reserved and uncommunicative)

Sense 2
buttoned-up -- (conservative in professional manner; "employers are looking for buttoned-up types")
       => conservative (vs. liberal) -- (resistant to change)