| ideal | (adjective) of or relating to the philosophical doctrine of the reality of ideas | Synonyms: idealistic |
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| (adjective) constituting or existing only in the form of an idea or mental image or conception | - |
| (adjective) conforming to an ultimate standard of perfection or excellence; embodying an ideal | - |
| idealised | (adjective) exalted to an ideal perfection or excellence | Synonyms: idealized |
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| idealistic | (adjective) of or relating to the philosophical doctrine of the reality of ideas | Synonyms: ideal |
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| (adjective) of high moral or intellectual value; elevated in nature or style | Synonyms: elevated, exalted, grand, high-flown, high-minded, lofty, noble-minded, rarefied, rarified, sublime |
| idealized | (adjective) exalted to an ideal perfection or excellence | Synonyms: idealised |
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| ideational | (adjective) being of the nature of a notion or concept | Synonyms: conceptional, notional |
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| idempotent | (adjective) unchanged in value following multiplication by itself | - |
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| identical | (adjective) (of twins) derived from a single egg or ovum | Synonyms: monovular |
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| (adjective) coinciding exactly when superimposed | Synonyms: superposable |
| (adjective) having properties with uniform values along all axes | - |
| (adjective) exactly alike; incapable of being perceived as different | Synonyms: indistinguishable |
| (adjective) being the exact same one; not any other: | Synonyms: selfsame, very |
| identifiable | (adjective) capable of being identified | - |
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| identified | (adjective) having the identity known or established | - |
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| ideographic | (adjective) of or relating to or consisting of ideograms | - |
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| ideologic | (adjective) concerned with or suggestive of ideas | Synonyms: ideological |
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| ideological | (adjective) of or pertaining to or characteristic of an orientation that characterizes the thinking of a group or nation | - |
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| (adjective) concerned with or suggestive of ideas | Synonyms: ideologic |
| idiographic | (adjective) relating to or involving the study of individuals | - |
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| idiomatic | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatical |
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| idiomatical | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatic |
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| idiopathic | (adjective) (of diseases) arising from an unknown cause | - |
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| idiosyncratic | (adjective) peculiar to the individual | - |
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| idiotic | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, laughable, ludicrous, nonsensical, preposterous, ridiculous |
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| (adjective) insanely irresponsible | Synonyms: crackbrained |
| (adjective) having a mental age of three to seven years | Synonyms: imbecile, imbecilic |
| idle | (adjective) not in action or at work | - |
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| (adjective) silly or trivial | Synonyms: light |
| (adjective) not in active use | Synonyms: unused |
| (adjective) lacking a sense of restraint or responsibility | Synonyms: loose |
| (adjective) not having a job | Synonyms: jobless, out of work |
| (adjective) not yielding a return | Synonyms: dead |
| (adjective) without a basis in reason or fact | Synonyms: baseless, groundless, unfounded, unwarranted, wild |
| idolatrous | (adjective) relating to or practicing idolatry | - |
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| (adjective) blindly or excessively devoted or adoring | - |
| idolised | (adjective) regarded with deep or rapturous love (especially as if for a god) | Synonyms: adored, idolized, worshipped |
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| idolized | (adjective) regarded with deep or rapturous love (especially as if for a god) | Synonyms: adored, idolised, worshipped |
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| idyllic | (adjective) excellent and delightful in all respects | - |
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| (adjective) suggestive of an idyll; charmingly simple and serene | - |