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trouble
The word carries a heavy sense of friction—either external (conflicts, obstacles) or internal (anxiety, guilt). It suggests an interruption of peace or order. As a noun, it often implies a state of being "in" something negative, suggesting a lack of control or a consequence for actions. Unlike "problem," which can be a neutral puzzle to solve, "trouble" usually feels more emotional or punitive. As a verb, the nuance shifts toward social friction and imposition. When used as an apology ("sorry to trouble you"), it serves as a polite social lubricant to acknowledge that the speaker is infringing on someone else's time or peace.
Uncountable when referring to a general state of distress or difficulty ('I'm in a lot of trouble'). Countable when referring to specific problems, complaints, or mechanical failures ('We are having some engine troubles').