Antonyms of adj buttoned-down

1 sense of buttoned-down

Sense 1
button-down, buttoned-down, conservative -- (unimaginatively conventional; "a colorful character in the buttoned-down, dull-grey world of business"- Newsweek)

INDIRECT (VIA conventional, conventional) -> unconventional -- (not conventional or conformist; "unconventional life styles")

Similarity of adj buttoned-down

1 sense of buttoned-down

Sense 1
button-down, buttoned-down, conservative -- (unimaginatively conventional; "a colorful character in the buttoned-down, dull-grey world of business"- Newsweek)
       => conventional (vs. unconventional) -- (unimaginative and conformist; "conventional bourgeois lives"; "conventional attitudes")