| insubordination | (noun) an insubordinate act | Synonyms: rebelliousness |
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| (noun) defiance of authority | - |
| insubstantiality | (noun) lacking substance or reality | - |
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| (noun) lack of solid substance and strength | - |
| insufficiency | (noun) lack of an adequate quantity or number | Synonyms: deficiency, inadequacy |
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| (noun) (pathology) inability of a bodily part or organ to function normally | - |
| (noun) a lack of competence | Synonyms: inadequacy |
| insufflation | (noun) an act of blowing or breathing on or into something | - |
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| (noun) (medicine) blowing air or medicated powder into the lungs (or into some other body cavity) | - |
| insulant | (noun) insulating material that reduces or prevents the transmission of heat or sound or electricity | Synonyms: insulation |
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| insularism | (noun) the state of being isolated or detached | Synonyms: detachment, insularity, insulation |
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| insularity | (noun) the state of being isolated or detached | Synonyms: detachment, insularism, insulation |
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| insulation | (noun) the act of protecting something by surrounding it with material that reduces or prevents the transmission of sound or heat or electricity | - |
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| (noun) the state of being isolated or detached | Synonyms: detachment, insularism, insularity |
| (noun) insulating material that reduces or prevents the transmission of heat or sound or electricity | Synonyms: insulant |
| insulator | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: dielectric, nonconductor |
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| insulin | (noun) hormone secreted by the isles of Langerhans in the pancreas; regulates storage of glycogen in the liver and accelerates oxidation of sugar in cells | - |
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| insult | (noun) a deliberately offensive act or something producing the effect of deliberate disrespect | Synonyms: affront |
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| (noun) a rude expression intended to offend or hurt | Synonyms: abuse, contumely, revilement, vilification |
| insurability | (noun) the quality of being insurable; the conditions under which an insurance company will issue insurance to an applicant (based on standards set by the insurance company) | - |
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| insurance | (noun) written contract or certificate of insurance | Synonyms: insurance policy, policy |
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| (noun) promise of reimbursement in the case of loss; paid to people or companies so concerned about hazards that they have made prepayments to an insurance company | - |
| (noun) protection against future loss | Synonyms: indemnity |
| insured | (noun) a person whose interests are protected by an insurance policy; a person who contracts for an insurance policy that indemnifies him against loss of property or life or health etc. | Synonyms: insured person |
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| insurer | (noun) a financial institution that sells insurance | Synonyms: insurance company, insurance firm, insurance underwriter, underwriter |
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| insurgence | (noun) an organized rebellion aimed at overthrowing a constituted government through the use of subversion and armed conflict | Synonyms: insurgency |
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| insurgency | (noun) an organized rebellion aimed at overthrowing a constituted government through the use of subversion and armed conflict | Synonyms: insurgence |
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| insurgent | (noun) a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions) | Synonyms: freedom fighter, insurrectionist, rebel |
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| (noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment | Synonyms: guerilla, guerrilla, irregular |
| insurrection | (noun) organized opposition to authority; a conflict in which one faction tries to wrest control from another | Synonyms: rebellion, revolt, rising, uprising |
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| insurrectionism | (noun) the principle of revolt against constituted authority | - |
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| insurrectionist | (noun) a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions) | Synonyms: freedom fighter, insurgent, rebel |
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