| infeasibility | (noun) the quality of not being doable | Synonyms: unfeasibility |
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| infection | (noun) moral corruption or contamination | - |
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| (noun) (international law) illegality that taints or contaminates a ship or cargo rendering it liable to seizure | - |
| (noun) the communication of an attitude or emotional state among a number of people | Synonyms: contagion |
| (noun) an incident in which an infectious disease is transmitted | Synonyms: contagion, transmission |
| (noun) (medicine) the invasion of the body by pathogenic microorganisms and their multiplication which can lead to tissue damage and disease | - |
| (noun) (phonetics) the alteration of a speech sound under the influence of a neighboring sound | - |
| (noun) the pathological state resulting from the invasion of the body by pathogenic microorganisms | - |
| infelicity | (noun) inappropriate and unpleasing manner or style (especially manner or style of expression) | - |
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| inference | (noun) the reasoning involved in drawing a conclusion or making a logical judgment on the basis of circumstantial evidence and prior conclusions rather than on the basis of direct observation | Synonyms: illation |
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| inferior | (noun) a character or symbol set or printed or written beneath or slightly below and to the side of another character | Synonyms: subscript |
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| (noun) one of lesser rank or station or quality | - |
| inferiority | (noun) an inferior quality | Synonyms: low quality |
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| (noun) the quality of being a competitive disadvantage | Synonyms: unfavorable position |
| (noun) the state of being inferior | Synonyms: lower rank, lower status |
| infernal | (noun) an inhabitant of Hell | - |
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| inferno | (noun) a very intense and uncontrolled fire | Synonyms: conflagration |
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| (noun) any place of pain and turmoil | Synonyms: hell, hell on earth, hellhole, snake pit, the pits |
| infertility | (noun) the state of being unable to produce offspring; in a woman it is an inability to conceive; in a man it is an inability to impregnate | Synonyms: sterility |
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| infestation | (noun) a swarm of insects that attack plants | Synonyms: plague |
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| (noun) the state of being invaded or overrun by parasites | - |