infection, n. [contagion], [contamination], [vitiation], [pollution].
infectious, a. [contagious], [pestiferous], epidemic, vitiating.
infer, v. deduce, imply, [gather].
inference, n. [deduction], [conclusion], illation, corollary.
inferior, a. poorer, [lower], subordinate, [menial], [minor], [mediocre], subaltern.
inferior, n. subordinate. Antonyms: [peer], [equal], [superior].
inferiority, n. subordinacy, [mediocrity], [deficiency].
infidel, n. [free-thinker], atheist, [unbeliever], [skeptic].
infirmity, n. See weakness.
inflammable, a. combustible, accendible; irascible, [irritable], [excitable].