| infatuate | (verb) arouse unreasoning love or passion in and cause to behave in an irrational way | - |
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| infect | (verb) contaminate with a disease or microorganism | Synonyms: taint |
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| (verb) communicate a disease to | - |
| (verb) affect in a contagious way | - |
| (verb) corrupt with ideas or an ideology | - |
| infer | (verb) reason by deduction; establish by deduction | Synonyms: deduce, deduct, derive |
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| (verb) believe to be the case | Synonyms: understand |
| (verb) guess correctly; solve by guessing | Synonyms: guess |
| (verb) conclude by reasoning; in logic | Synonyms: deduce |
| (verb) draw from specific cases for more general cases | Synonyms: extrapolate, generalise, generalize |
| infest | (verb) invade in great numbers | Synonyms: overrun |
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| (verb) live on or in a host, as of parasites | - |
| (verb) occupy in large numbers or live on a host | Synonyms: invade, overrun |
| 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 |
| infix | (verb) attach a morpheme into a stem word | - |
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| (verb) put or introduce into something | Synonyms: enter, insert, introduce |
| inflame | (verb) become inflamed; get sore | - |
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| (verb) cause inflammation in | - |
| (verb) arouse or excite feelings and passions | Synonyms: fire up, heat, ignite, stir up, wake |
| (verb) cause to start burning | Synonyms: conflagrate, enkindle, kindle |
| (verb) catch fire | Synonyms: kindle |
| inflate | (verb) fill with gas or air | Synonyms: blow up |
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| (verb) exaggerate or make bigger | Synonyms: amplify, blow up, expand |
| (verb) become inflated | Synonyms: balloon, billow |
| (verb) increase the amount or availability of, creating a rise in value | - |
| (verb) cause prices to rise by increasing the available currency or credit | - |
| inflect | (verb) vary the pitch of one's speech | Synonyms: modulate, tone |
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| (verb) change the form of a word in accordance as required by the grammatical rules of the language | - |
| inflict | (verb) impose something unpleasant | Synonyms: bring down, impose, visit |
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| influence | (verb) shape or influence; give direction to | Synonyms: determine, mold, mould, regulate, shape |
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| (verb) induce into action by using one's charm | Synonyms: charm, tempt |
| (verb) have and exert influence or effect | Synonyms: act upon, work |
| inform | (verb) give character or essence to | - |
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| (verb) impart knowledge of some fact, state of affairs, or event to | - |
| (verb) act as an informer | - |
| infract | (verb) act in disregard of laws, rules, contracts, or promises | Synonyms: breach, break, go against, offend, transgress, violate |
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| infringe | (verb) advance beyond the usual limit | Synonyms: encroach, impinge |
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| (verb) go against, as of rules and laws | Synonyms: conflict, contravene, run afoul |
| infuriate | (verb) make furious | Synonyms: exasperate, incense |
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| infuscate | (verb) darken with a brownish tinge, as of insect wings | - |
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| infuse | (verb) introduce into the body through a vein, for therapeutic purposes | - |
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| (verb) let sit in a liquid to extract a flavor or to cleanse | Synonyms: steep |
| (verb) fill, as with a certain quality | Synonyms: impregnate, instill, tincture |
| (verb) undergo the process of infusion | - |
| (verb) teach and impress by frequent repetitions or admonitions | Synonyms: inculcate, instill |