GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 363 invalid (adj) Having no force, weight, or cogency invalid (n) One who is disabled by illness or injury invalidate (v) To render of no force or effect invaluable (adj) Exceedingly precious invariable (adj) Unchangeable invasion (n) Encroachment, as by an act of intrusion or trespass invective (n) An utterance intended to cast censure, or reproach inveigh (v) To utter vehement censure or invective