1. to weaken, to grow weak, to wane, to decline (of one's health)
2. to be downcast, to be dejected, to be dispirited
3. to be troubled, to be at a loss, to be perplexed, to be annoyed
1. illness (usu. excluding minor ailments, e.g. common cold), disease, sickness
2. bad habit, bad behaviour, weakness, failing
3. crazy, insane, disturbed, sick in the head