- difficult to deal with; "a troublesome infection"; "a troublesome situation"
- (troublesomeness) a difficulty that causes anxiety
- Giving trouble or anxiety; vexatious; burdensome; wearisome
- a threshold concept may be far from ‘common sense’ understandings of the world and thus initially very difficult for learners to accept. ...
- (adjective) -- causing problems, usually for others ch. 9
- trouble-causing; disturbing