(transitive, now rare) To disturb, stir up, agitate (a medium, especially water). / (transitive) To mentally distress; to cause (someone) to be anxious or perplexed.

A distressing or dangerous situation. / A difficulty, problem, condition, or action contributing to such a situation. / A violent occurrence or event.

(Ireland, historical) The continued violence and terrorist, military and paramilitary activity in Northern Ireland that happened from the mid 1960s to the late 1990s.

plural of trouble

simple past tense and past participle of trouble

anxious, worried, careworn.

Third-person singular simple present indicative form of trouble

Suffering difficulties. / (chiefly of a child) Liable to be punished for misbehavior; in disgrace. / (euphemistic) Pregnant, unmarried, and not likely to be married before giving birth.

present participle of trouble

distressing, worrying