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inferiority the fact or condition of being lesser in quality, worth, importance, rank, or position.
inferiority complex a neurotic condition caused by intense feelings of inferiority or inadequacy and characterized by either extreme reserve or aggressive behavior. [2 definitions]
infernal of or pertaining to hell or the world of the dead. [3 definitions]
inferno hell. [2 definitions]
infertile of land, not fertile or productive; barren. [2 definitions]
infest to spread in or overrun as a nuisance or danger. [2 definitions]
infidel one who does not believe in or accept a religious faith, esp. that of Christianity or Islam. [2 definitions]
infidelity unfaithfulness, esp. to marital vows; adultery. [3 definitions]
infield a baseball diamond, the positions at the four corners of the diamond, or the players playing those positions as a group. (Cf. outfield.) [2 definitions]
infielder a baseball player whose position is in the infield.
infighting combat at close range, as in boxing. [2 definitions]
infiltrate to go into or through as though by filtering, esp. for destructive purposes. [4 definitions]
infinite having no bounds or limits; not measurable; limitless. [3 definitions]
infinitesimal of a thing or quantity, too small to be measured or calculated. [2 definitions]
infinitive in grammar, the form of a verb that is unmarked for person, tense, or aspect, and that functions as a noun, adjective, or complement, such as "to leave" in "To leave now would be a mistake". [2 definitions]
infinitude the quality or condition of being infinite. [2 definitions]
infinity the character or condition of being infinite. [5 definitions]
infirm weak or ill, as from old age. [2 definitions]
infirmary a place for the care of the ill or injured, such as a hospital or clinic, or a space devoted to such care in an institutional residence such as a school or camp.
infirmity a physical weakness, disability, or illness. [3 definitions]
infix to fasten, set, or drive in. [5 definitions]