- -some [səm] suffix[Sense: 1; Origin: Old English -sum][Sense: 2; Origin: some]1.) [in adjectives]tending to behave in a particular way, or having a particular quality▪ a troublesome boy (=who causes trouble)▪ a bothersome back injury (=that bothers you)2.) [in nouns]a group of a particular number, for example in a game▪ a golf foursome (=four people playing golf together)
Dictionary of contemporary English. 2013.