| unbearable | (adjective) incapable of being tolerated or endured | Synonyms: intolerable, unendurable |
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| unbeatable | (adjective) incapable of being overcome or subdued | Synonyms: invincible, unvanquishable |
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| (adjective) hard to defeat | - |
| unbeaten | (adjective) not conquered | Synonyms: unconquered, unvanquished |
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| unbecoming | (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, indecorous, uncomely, unseemly, untoward |
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| unbefitting | (adjective) not befitting | - |
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| unbeholden | (adjective) free of moral obligation | - |
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| unbeknown | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknownst |
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| unbeknownst | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknown |
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| unbelievable | (adjective) beyond belief or understanding | Synonyms: incredible |
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| (adjective) having a probability too low to inspire belief | Synonyms: improbable, unconvincing, unlikely |
| unbelieving | (adjective) holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible | Synonyms: nescient |
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| (adjective) denying or questioning the tenets of especially a religion | Synonyms: disbelieving, sceptical, skeptical |
| (adjective) rejecting any belief in gods | Synonyms: atheistic, atheistical |
| unbeloved | (adjective) unhappy in love; suffering from unrequited love | Synonyms: bereft, lovelorn |
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| unbelted | (adjective) lacking a belt | Synonyms: beltless |
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| unbendable | (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steadfast, steady, stiff, unfaltering, unshakable, unwavering |
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| unbending | (adjective) incapable of adapting or changing to meet circumstances | Synonyms: inflexible, rigid |
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| unbeneficed | (adjective) not having a benefice | - |
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| unbent | (adjective) erect in posture | Synonyms: straight, unbowed |
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| (adjective) not bent | - |