| audacious | (adjective) disposed to venture or take risks | Synonyms: daring, venturesome, venturous |
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| (adjective) invulnerable to fear or intimidation | Synonyms: brave, dauntless, fearless, hardy, intrepid, unfearing |
| (adjective) unrestrained by convention or propriety | Synonyms: bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen, insolent |
| audible | (adjective) heard or perceptible by the ear | Synonyms: hearable |
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| audile | (adjective) of or relating to the process of hearing | Synonyms: auditive, auditory |
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| audiometric | (adjective) of or relating to audiometry | - |
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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| auditive | (adjective) of or relating to the process of hearing | Synonyms: audile, auditory |
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| auditory | (adjective) of or relating to the process of hearing | Synonyms: audile, auditive |
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