Antonyms of adj fattish

1 sense of fattish

Sense 1
fattish -- (somewhat fat)

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 fattish

1 sense of fattish

Sense 1
fattish -- (somewhat fat)
       => fat (vs. thin) -- (having an (over)abundance of flesh; "he hadn't remembered how fat she was")