Antonyms of adj buxom

2 senses of buxom

Sense 1
bosomy, busty, buxom, curvaceous, curvy, full-bosomed, sonsie, sonsy, stacked, voluptuous, well-endowed -- ((of a woman's body) having a large bosom and pleasing curves; "Hollywood seems full of curvaceous blondes"; "a curvy young woman in a tight dress")

INDIRECT (VIA shapely) -> unshapely -- (not well-proportioned and pleasing in shape; "a stout unshapely woman")

Sense 2
buxom, zaftig, zoftig -- ((of a female body) healthily plump and vigorous ; "a generation ago...buxom actresses were popular"- Robt.A.Hamilton;)

INDIRECT (VIA fat) -> thin, lean -- (lacking excess flesh; "you can't be too rich or too thin"; "Yon Cassius has a lean and hungry look"-Shakespeare)

Similarity of adj buxom

2 senses of buxom

Sense 1
bosomy, busty, buxom, curvaceous, curvy, full-bosomed, sonsie, sonsy, stacked, voluptuous, well-endowed -- ((of a woman's body) having a large bosom and pleasing curves; "Hollywood seems full of curvaceous blondes"; "a curvy young woman in a tight dress")
       => shapely (vs. unshapely) -- (having a well-proportioned and pleasing shape; "a slim waist and shapely legs")

Sense 2
buxom, zaftig, zoftig -- ((of a female body) healthily plump and vigorous ; "a generation ago...buxom actresses were popular"- Robt.A.Hamilton;)
       => fat (vs. thin) -- (having an (over)abundance of flesh; "he hadn't remembered how fat she was")