| infidel | (noun) a person who does not acknowledge your god | Synonyms: gentile, heathen, pagan |
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| infidelity | (noun) the quality of being unfaithful | Synonyms: unfaithfulness |
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| infield | (noun) the area of a baseball field that is enclosed by 3 bases and home plate | Synonyms: baseball diamond, diamond |
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| infielder | (noun) (baseball) a person who plays a position in the infield | - |
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| infighting | (noun) boxing at close quarters | - |
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| (noun) conflict between members of the same organization (usually concealed from outsiders) | - |
| infiltrate | (verb) pass through an enemy line; in a military conflict | Synonyms: pass through |
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| (verb) cause (a liquid) to enter by penetrating the interstices | - |
| (verb) pass into or through by filtering or permeating | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: penetrate |
| infiltration | (noun) a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection) | - |
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| (noun) the slow passage of a liquid through a filtering medium | Synonyms: percolation |
| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
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| (noun) someone who takes up a position surreptitiously for the purpose of espionage | - |
| infinite | (adjective) having no limits or boundaries in time or space or extent or magnitude | - |
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| (adjective) (of verbs) not having tense, person, or number (as a participle or gerund or infinitive) | Synonyms: non-finite, nonfinite |
| (adjective) total and all-embracing | - |
| (adjective) too numerous to be counted | Synonyms: countless, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
| (noun) the unlimited expanse in which everything is located | Synonyms: space |
| infinitely | (adverb) continuing forever without end | Synonyms: endlessly |
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| (adverb) without bounds | Synonyms: boundlessly, immeasurably |
| infiniteness | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infinitude, limitlessness, unboundedness |
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| infinitesimal | (adjective) infinitely or immeasurably small | Synonyms: minute |
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| (noun) (mathematics) a variable that has zero as its limit | - |
| infinitival | (adjective) relating to or formed with the infinitive | - |
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| infinitive | (noun) the uninflected form of the verb | - |
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| infinitude | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infiniteness, limitlessness, unboundedness |
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| (noun) an infinite quantity | - |
| infinity | (noun) time without end | Synonyms: eternity |
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| infirm | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, feeble, rickety, sapless, weak, weakly |
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| (adjective) lacking firmness of will or character or purpose | - |
| infirmary | (noun) a health facility where patients receive treatment | Synonyms: hospital |
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| infirmity | (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, feebleness, frailness, frailty, valetudinarianism |
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| infix | (noun) an affix that is inserted inside the word | - |
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| (verb) attach a morpheme into a stem word | - |
| (verb) put or introduce into something | Synonyms: enter, insert, introduce |