a. [ Compar. Leakier superl. Leakiest. ]1. Permitting water or other fluid to leak in or out; as, a leaky roof or cask; a leaky faucet. [ 1913 Webster ]
2. Apt to disclose secrets; tattling; not close. [ Colloq. ] [ 1913 Webster ]
3. (Genetics) Retaining some function; not completely inactivating the gene; as, substitution mutations are sometimes leaky; -- of mutations. [ PJC ]