Longman Dictionary of Contemporary English - rotten

~1 adj 1 badly decayed  (rotten fruit | the smell of rotten eggs | The wood was completely rotten.) 2 informal very nasty or unpleasant  (What rotten weather! | It's a rotten thing to do.) 3 informal a word meaning very bad at doing something, or very badly done, used especially when you feel annoyed about this  (He's a rotten driver.) 4 feel rotten a) to feel ill b) to feel unhappy and guilty about something + abou  (I felt rotten about having to fire him.) 5 a rotten apple one bad person who has a bad effect on all the others in a group - rottenly adv - rottenness n rot away phr v to decay completely and disappear or break into small pieces, or to make something do this  (In places the timbers have rotted away.) ~2 adv informal 1 spoil sb rotten to treat someone too well or too kindly, especially a child  (Melanie's beautiful, wilful, and she's been spoiled rotten all her life.) 2 fancy sb rotten BrE humorous to be extremely attracted to someone in a sexual way