1. intensely enthusiastic about or preoccupied with - crazy about cars and racing - he is potty about her • Syn: crazy, wild, dotty • Similar to: enthusiastic • Derivationally related forms: craze (for: crazy), craziness (for: crazy) • Usage Domain: colloquialism 2. mentally or physically infirm with age - his mother was doddering and frail • Syn: doddering, doddery, senile • Similar to: old • Derivationally related forms: senility (for: senile)