| insectan | (adjective) of or relating to the class Insecta | - |
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| insecticidal | (adjective) of or relating to insecticide | - |
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| insectivorous | (adjective) (of animals and plants) feeding on insects | - |
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| insecure | (adjective) lacking self-confidence or assurance | - |
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| (adjective) lacking in security or safety | Synonyms: unsafe |
| (adjective) not firm or firmly fixed; likely to fail or give way | - |
| (adjective) not safe from attack | Synonyms: unsafe |
| insensate | (adjective) devoid of feeling and consciousness and animation | Synonyms: insentient |
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| (adjective) without compunction or human feeling | Synonyms: cold-blooded, cold, inhuman |
| insensible | (adjective) incapable of physical sensation | - |
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| (adjective) barely able to be perceived | Synonyms: indiscernible, undetectable |
| (adjective) unresponsive to stimulation | Synonyms: out of it, senseless |
| (adjective) unaware of or indifferent to | Synonyms: unaffected |
| insensitive | (adjective) not responsive to physical stimuli | - |
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| (adjective) deficient in human sensibility; not mentally or morally sensitive | - |
| insentient | (adjective) devoid of feeling and consciousness and animation | Synonyms: insensate |
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| inseparable | (adjective) not capable of being separated | - |
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