The Collaborative International Dictionary of English v.0.48:
Fattish \Fat"tish\, a. Somewhat fat; inclined to fatness. [1913 Webster] Coleridge, a puffy, anxious, obstructed-looking, fattish old man. --Carlyle. [1913 Webster]WordNet (r) 3.0 (2006):
fattish adj 1: somewhat fat