| insect | (noun) small air-breathing arthropod | - |
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| (noun) a person who has a nasty or unethical character undeserving of respect | Synonyms: dirt ball, louse, worm |
| insecticide | (noun) a chemical used to kill insects | Synonyms: insect powder |
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| insectifuge | (noun) a chemical substance that repels insects | Synonyms: insect repellant, insect repellent |
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| insectivore | (noun) small insect-eating mainly nocturnal terrestrial or fossorial mammals | - |
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| (noun) any organism that feeds mainly on insects | - |
| insecureness | (noun) the state of being exposed to risk or anxiety | - |
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| insecurity | (noun) the anxiety you experience when you feel vulnerable and insecure | - |
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| (noun) the state of being subject to danger or injury | - |
| insemination | (noun) the introduction of semen into the genital tract of a female | - |
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| (noun) the act of sowing (of seeds in the ground or, figuratively, of germs in the body or ideas in the mind, etc.) | - |
| insensibility | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, callousness, hardness, unfeelingness |
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| (noun) a lack of sensibility | - |
| insensitiveness | (noun) the inability to respond to affective changes in your interpersonal environment | Synonyms: insensitivity |
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| insensitivity | (noun) the inability to respond to affective changes in your interpersonal environment | Synonyms: insensitiveness |
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| insentience | (noun) lacking consciousness or ability to perceive sensations | - |
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| insert | (noun) (film) a still picture that is introduced and that interrupts the action of a film | Synonyms: cut-in |
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| (noun) (broadcasting) a local announcement inserted into a network program | Synonyms: cut-in |
| (noun) an artifact that is inserted or is to be inserted | Synonyms: inset |
| (noun) a folded section placed between the leaves of another publication | - |
| insertion | (noun) the act of putting one thing into another | Synonyms: introduction, intromission |
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| (noun) a message (spoken or written) that is introduced or inserted | Synonyms: interpolation |
| inset | (noun) a piece of material used to strengthen or enlarge a garment | Synonyms: gusset |
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| (noun) an artifact that is inserted or is to be inserted | Synonyms: insert |
| (noun) a small picture inserted within the bounds or a larger one | - |