| insubordinate | (adjective) not submissive to authority | - |
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| (adjective) disposed to or engaged in defiance of established authority | Synonyms: resistant, resistive |
| insubordination | (noun) an insubordinate act | Synonyms: rebelliousness |
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| (noun) defiance of authority | - |
| insubstantial | (adjective) lacking material form or substance; unreal | Synonyms: unreal, unsubstantial |
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| (adjective) lacking in nutritive value | - |
| (adjective) lacking solidity or strength | Synonyms: flimsy |
| insubstantiality | (noun) lacking substance or reality | - |
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| (noun) lack of solid substance and strength | - |
| insubstantially | (adverb) not substantially; lacking substantial expression or fullness | Synonyms: impalpably |
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| insufferable | (adjective) unbearably arrogant or conceited | - |
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| (adjective) too extreme to bear | Synonyms: unsufferable |
| insufferably | (adverb) in an extremely arrogant or conceited manner | - |
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| (adverb) to an insufferable degree | Synonyms: unsufferably |
| 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 |
| insufficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: deficient |
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| insufficiently | (adverb) to an insufficient degree | - |
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| insufflate | (verb) blow or breathe hard on or into | - |
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| (verb) treat by blowing a powder or vapor into a bodily cavity | - |
| (verb) breathe or blow onto as a ritual or sacramental act, especially so as to symbolize the action of the Holy Spirit | - |
| 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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| insular | (adjective) relating to or characteristic of or situated on an island | - |
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| (adjective) suggestive of the isolated life of an island | - |
| (adjective) narrowly restricted in outlook or scope | Synonyms: parochial |
| 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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| insulate | (verb) place or set apart | Synonyms: isolate |
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| (verb) protect from heat, cold, or noise by surrounding with insulating material | - |
| 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 |
| (verb) treat, mention, or speak to rudely | Synonyms: affront, diss |
| insulting | (adjective) expressing extreme contempt | Synonyms: contemptuous, disdainful, scornful |
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| insultingly | (adverb) in an unfair and insulting manner | Synonyms: foully |
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| (adverb) in a disrespectful and insulting manner | - |
| insuperable | (adjective) incapable of being surmounted or excelled | Synonyms: unconquerable |
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| (adjective) impossible to surmount | Synonyms: insurmountable |
| insuperably | (adverb) to an insuperable degree | - |
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| insupportable | (adjective) incapable of being justified or explained | Synonyms: indefensible, unjustifiable, unwarrantable, unwarranted |
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| 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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| insurable | (adjective) capable of being insured or eligible to be insured | - |
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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 |
| insure | (verb) be careful or certain to do something; make certain of something | Synonyms: ascertain, assure, check, control, ensure, see, see to it |
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| (verb) protect by insurance | Synonyms: cover, underwrite |
| (verb) make certain of | Synonyms: assure, ensure, guarantee, secure |
| (verb) take out insurance for | - |
| insured | (adjective) covered by insurance | - |
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| (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 |
| 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 | (adjective) in opposition to a civil authority or government | Synonyms: seditious, subversive |
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| (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 |
| (noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment | Synonyms: guerilla, guerrilla, irregular |
| insurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: unsurmountable |
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| (adjective) impossible to surmount | Synonyms: insuperable |
| 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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| insurrectional | (adjective) of or relating to or given to insurrection | Synonyms: insurrectionary |
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| insurrectionary | (adjective) of or relating to or given to insurrection | Synonyms: insurrectional |
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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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| insusceptible | (adjective) not susceptible to | Synonyms: unsusceptible |
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