| infallibility | (noun) the quality of never making an error | - |
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| infamy | (noun) a state of extreme dishonor | Synonyms: opprobrium |
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| (noun) evil fame or public reputation | - |
| infancy | (noun) the earliest state of immaturity | Synonyms: babyhood |
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| (noun) the early stage of growth or development | Synonyms: babyhood, early childhood |
| infant | (noun) a very young child (birth to 1 year) who has not yet begun to walk or talk | Synonyms: babe, baby |
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| infanticide | (noun) murdering an infant | - |
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| (noun) a person who murders an infant | - |
| infantilism | (noun) infantile behavior in mature persons | - |
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| (noun) an abnormal condition in which an older child or adult retains infantile characteristics | - |
| infantry | (noun) an army unit consisting of soldiers who fight on foot | Synonyms: foot |
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| infantryman | (noun) fights on foot with small arms | Synonyms: foot soldier, footslogger, marcher |
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| infarct | (noun) localized necrosis resulting from obstruction of the blood supply | Synonyms: infarction |
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| infarction | (noun) localized necrosis resulting from obstruction of the blood supply | Synonyms: infarct |
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| infatuation | (noun) an object of extravagant short-lived passion | - |
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| (noun) a foolish and usually extravagant passion or love or admiration | - |
| (noun) temporary love of an adolescent | Synonyms: calf love, crush, puppy love |