| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| fastidious | (adjective) giving careful attention to detail; hard to please; excessively concerned with cleanliness | - |
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| (adjective) having complicated nutritional requirements; especially growing only in special artificial cultures | Synonyms: exacting |
| 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 |
| insidious | (adjective) intended to entrap | - |
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| (adjective) working or spreading in a hidden and usually injurious way | Synonyms: pernicious, subtle |
| (adjective) beguiling but harmful | - |
| invidious | (adjective) containing or implying a slight or showing prejudice | Synonyms: discriminatory |
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| meridional | (adjective) of or relating to a meridian | - |
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| (adjective) located in the south or characteristic of southern people or places | - |
| perfidious | (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: punic, treacherous |
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| unfastidious | (adjective) marked by an absence of due or proper care or attention to detail; not concerned with cleanliness | - |
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| (adjective) not exacting in nutritional requirements | - |