lisp·ing I. \-piŋ\noun (-s) Etymology: Middle English, from gerund of lispen to lisp 1.: defective pronunciation of sibilants < interdental lisping > 2.: lisp II 2 < the first lispings of Greek art — Florence Simmonds > < low lispings of the summer rain — H.W.Longfellow > II. adjective Etymology: from present participle of lisp (I) : characterized by a lisp or lisping • lisp·ing·lyadverb