[-some] adj suffix [ME -som, fr. OE -sum; akin to OHG -sam -some, OE sum some]: characterized by a (specified) thing, quality, state, or action "awesome" "burdensome" "cuddlesome"
[2]-some n suffix [ME (northern dial.) -sum, fr. ME sum, pron., one, some]: group of (so many) members and esp. persons "foursome" [3]-some n comb form [NL -somat-, -soma, fr. Gk somat-, soma] 1: body "chromosome"
2: chromosome "monosome"