| aeronautic | (adjective) of or pertaining to aeronautics | Synonyms: aeronautical |
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| aeronautical | (adjective) of or pertaining to aeronautics | Synonyms: aeronautic |
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| astronautic | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautical |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| banausic | (adjective) (formal) ordinary and not refined | - |
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| binaural | (adjective) relating to or having or hearing with two ears | Synonyms: biaural |
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| inaudible | (adjective) impossible to hear; imperceptible by the ear | Synonyms: unhearable |
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| inaugural | (adjective) occurring at or characteristic of a formal investiture or induction | - |
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| (adjective) serving to set in motion | Synonyms: first, initiative, initiatory, maiden |
| inauspicious | (adjective) not auspicious; boding ill | Synonyms: unfortunate |
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| (adjective) contrary to your interests or welfare | Synonyms: adverse, untoward |
| (adjective) presaging ill fortune | Synonyms: ill, ominous |
| inauthentic | (adjective) false or fake; not what it appears to be | Synonyms: spurious, unauthentic |
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| monaural | (adjective) relating to or having or hearing with only one ear | - |
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| naughty | (adjective) badly behaved | - |
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| (adjective) suggestive of sexual impropriety | Synonyms: blue, gamey, gamy, juicy, racy, risque, spicy |
| nauseated | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseous, queasy, sick, sickish |
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| nauseating | (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseous, noisome, offensive, queasy, sickening, vile |
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| nauseous | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, queasy, sick, sickish |
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| (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, noisome, offensive, queasy, sickening, vile |
| nautical | (adjective) relating to or involving ships or shipping or navigation or seamen | Synonyms: marine, maritime |
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| nonautonomous | (adjective) (of peoples and political bodies) controlled by outside forces | Synonyms: nonsovereign |
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| unauthentic | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, spurious |
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| unauthorised | (adjective) not endowed with authority | Synonyms: unauthorized |
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| (adjective) without official authorization | Synonyms: unauthorized, wildcat |
| unauthorized | (adjective) not endowed with authority | Synonyms: unauthorised |
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| (adjective) without official authorization | Synonyms: unauthorised, wildcat |