Definitions
1.verbTo disturb, stir up, agitate (a medium, especially water).
2.verbTo mentally distress; to cause (someone) to be anxious or perplexed."What she said about narcissism is troubling me."
3.verbIn weaker sense: to bother or inconvenience."I will not trouble you to deliver the letter."
4.verbTo take pains to do something."I won't trouble to post the letter today; I can do it tomorrow."
5.verbTo worry; to be anxious.
6.adjectiveAnxious, worried, careworn.