| infeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, unfeasible, unworkable |
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| infected | (adjective) containing or resulting from disease-causing organisms | Synonyms: septic |
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| infectious | (adjective) easily spread | - |
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| (adjective) of or relating to infection | - |
| (adjective) caused by infection or capable of causing infection | Synonyms: infective |
| infective | (adjective) caused by infection or capable of causing infection | Synonyms: infectious |
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| (adjective) able to cause disease | Synonyms: morbific, pathogenic |
| infelicitous | (adjective) not appropriate in application; defective | - |
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| (adjective) marked by or producing unhappiness | Synonyms: unhappy |
| inferential | (adjective) relating to or having the nature of illation or inference | Synonyms: illative |
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| (adjective) derived or capable of being derived by inference | - |
| (adjective) based on interpretation; not directly expressed | - |
| (adjective) of reasoning; proceeding from general premisses to a necessary and specific conclusion | - |
| (adjective) resembling or dependent on or arrived at by inference | Synonyms: illative |
| inferior | (adjective) written or printed below and to one side of another character | Synonyms: subscript |
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| (adjective) of or characteristic of low rank or importance | - |
| (adjective) of low or inferior quality | - |
| (adjective) having an orbit between the sun and the Earth's orbit | - |
| (adjective) lower than a given reference point | - |
| (adjective) falling short of some prescribed norm | Synonyms: deficient, substandard |
| infernal | (adjective) being of the underworld | - |
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| (adjective) characteristic of or resembling Hell | - |
| (adjective) of or pertaining to or characteristic of a very uncontrolled and intense fire | - |
| (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned |
| (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy |
| infertile | (adjective) incapable of reproducing | Synonyms: sterile, unfertile |
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