tidytidytidiertidiest1adjective (tidier, tidiest)1with everything in the right place: Her room is very tidy.2liking to have everything in the right place: a tidy boyoppositeuntidy▶ tidilyadverb: Put the books back tidily when you've finished with them.▶ tidinessnoun (no plural)tidytidytidiestidiedtidying2 (alsotidy up) verb (tidies, tidying, tidied/, has tidied)to make something tidy: I tidied the house before my parents arrived. Can you help me to tidy up?