Synonyms of worrying

2 Syllables
troublous, nervous, anxious, plaguy
3 Syllables
burdened, disturbing, perplexing, perturbing, bothered, disquieting, fluttery, unsettling, sobering, upsetting, vexatious, concerned, disquieted, distressful
4 Syllables
infestive, pessimistic, worrisome, troublesome, unamusing