GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 343 infidelity (n) Disloyalty infinite (adj) Measureless infinity (n) Boundless or immeasurable extension or duration infirm (adj) Lacking in bodily or mental strength infirmary (n) A place for the reception or treatment of the sick infirmity (n) A physical, mental, or moral weakness or flaw inflammable (adj) Easily set on fire or excited inflammation (n) A morbid process in some part of the body characterized by heat, swelling, and pain