worry

[1]	be anxious , be fearful , be concerned , fret , agonize , be distressed , be vexed , (Colloq) stew , bite/chew (one's) nails , go/get grey , get grey hair , (Slang) sweat blood , (US) sweat bullets
[2]	annoy , irk , pester , nettle , harry , harass , tease , bother , tantalize , torment , plague , hector , badger , nettle , gall , peeve , (Colloq) hassle
[3]	care
[4]	vex
[5]	concern , interest , occupy

[1]	concern , headache , vexation
[2]	trouble
[3]	concern , care , responsibility , problem , bother , trouble , affliction , irritation , annoyance , vexation
[4]	anguish , anxiety , uneasiness , unease , nervousness , distress , apprehension , disquiet , perturbation , agitation , upset , misgiving