Signs that carrots have gone bad include a slimy texture, a strong odour, and visible mould or discolouration. When carrots go limp, it usually means that they have lost some of their moisture and are beginning to dehydrate. While limp carrots are still safe to eat, they may be less crisp and fresh-tasting. To revive limp carrots, try soaking them in cold water for a few hours or steaming them briefly.