| unfaceted | (adjective) lacking facets | - |
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| unfading | (adjective) of an imaginary flower that never fades | Synonyms: amaranthine |
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| unfailing | (adjective) tireless | Synonyms: unflagging |
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| (adjective) always able to supply more | - |
| (adjective) not liable to failure | Synonyms: foolproof |
| unfair | (adjective) not fair; marked by injustice or partiality or deception | Synonyms: unjust |
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| unfaithful | (adjective) not true to duty or obligation or promises | - |
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| (adjective) having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, traitorous, treasonable, treasonous |
| (adjective) not trustworthy | - |
| unfaltering | (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steadfast, steady, stiff, unbendable, unshakable, unwavering |
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| unfamiliar | (adjective) not known or well known | - |
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| unfashionable | (adjective) not in accord with or not following current fashion | Synonyms: unstylish |
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| (adjective) unpopular and considered unappealing or unfashionable at the time | Synonyms: out of fashion |
| unfastened | (adjective) not closed or secured | - |
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| (adjective) not buttoned | Synonyms: unbuttoned |
| (adjective) not tied | Synonyms: untied |
| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: open |
| 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 | - |
| unfathomable | (adjective) of depth; not capable of being sounded or measured | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, abyssal |
| (adjective) incapable of being fully understood | - |
| unfathomed | (adjective) situated at or extending to great depth; too deep to have been sounded or plumbed | Synonyms: profound, unplumbed, unsounded |
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| unfattened | (adjective) (of market animals) not optimal for marketing | - |
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| unfavorable | (adjective) (of winds or weather) tending to hinder or oppose | Synonyms: unfavourable |
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| (adjective) not encouraging or approving or pleasing | Synonyms: unfavourable |
| (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: disadvantageous, unfavourable |
| unfavourable | (adjective) (of winds or weather) tending to hinder or oppose | Synonyms: unfavorable |
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| (adjective) not encouraging or approving or pleasing | Synonyms: unfavorable |
| (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: disadvantageous, unfavorable |
| unfearing | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, intrepid |
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| unfeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, infeasible, unworkable |
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| unfeathered | (adjective) having no feathers | Synonyms: featherless |
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| (adjective) not having feathers | - |
| unfed | (adjective) not fed | - |
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| (adjective) not given support | - |
| unfeeling | (adjective) devoid of feeling or sensation | - |
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| (adjective) devoid of feeling for others | Synonyms: hardhearted, stonyhearted |
| unfeigned | (adjective) not pretended; sincerely felt or expressed | Synonyms: genuine, true |
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| unfeminine | (adjective) not suitable for a woman | - |
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| unfenced | (adjective) not enclosed by a fence | - |
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| unfermented | (adjective) not soured or preserved | Synonyms: fresh, sweet |
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| unfertile | (adjective) incapable of reproducing | Synonyms: infertile, sterile |
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| unfertilised | (adjective) not having been fertilized | Synonyms: unfertilized, unimpregnated |
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| unfertilized | (adjective) not having been fertilized | Synonyms: unfertilised, unimpregnated |
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| unfettered | (adjective) not bound by shackles and chains | Synonyms: unchained, unshackled, untied |
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| unfilled | (adjective) of purchase orders that have not been filled | - |
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| unfilmed | (adjective) not recorded on film or tape | Synonyms: untaped |
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| unfinished | (adjective) not brought to an end or conclusion | - |
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| (adjective) not brought to the desired final state | - |
| (adjective) lacking a surface finish such as paint | Synonyms: bare |
| unfirm | (adjective) (of soil) unstable | Synonyms: shifting |
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| (adjective) not firmly or solidly positioned | Synonyms: unsteady |
| unfit | (adjective) not in good physical or mental condition; out of condition | - |
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| (adjective) below the required standards for a purpose | - |
| (adjective) physically unsound or diseased | Synonyms: bad, unsound |
| unfitting | (adjective) not in keeping with what is correct or proper | Synonyms: inappropriate, incompatible, out of keeping |
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| unfixed | (adjective) not firmly placed or set or fastened | - |
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| (adjective) lacking definition or definite content | Synonyms: nebulous |
| unflagging | (adjective) tireless | Synonyms: unfailing |
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| (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: indefatigable, tireless, unwearying |
| unflappable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: imperturbable |
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| unflattering | (adjective) showing or representing unfavorably | Synonyms: uncomplimentary |
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| unflavored | (adjective) without flavoring added | Synonyms: nonflavored, nonflavoured, unflavoured |
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| unflavoured | (adjective) without flavoring added | Synonyms: nonflavored, nonflavoured, unflavored |
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| unflawed | (adjective) without a flaw | Synonyms: flawless |
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| unfledged | (adjective) (of birds) not yet having developed feathers | Synonyms: immature |
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| (adjective) young and inexperienced | Synonyms: callow, fledgling |
| (adjective) (of an arrow) not equipped with feathers | Synonyms: fledgeless, unvaned |
| unflinching | (adjective) not shrinking from danger | Synonyms: unblinking, unintimidated, unshrinking |
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| unfluctuating | (adjective) not liable to fluctuate or especially to fall | Synonyms: firm, steady |
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| unflurried | (adjective) free from emotional agitation or nervous tension | Synonyms: unflustered, unperturbed, unruffled |
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| unflustered | (adjective) free from emotional agitation or nervous tension | Synonyms: unflurried, unperturbed, unruffled |
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| unfocused | (adjective) (of an image) not being in or brought into focus | Synonyms: unfocussed |
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| (adjective) not concentrated at one point or upon one objective | Synonyms: unfocussed |
| unfocussed | (adjective) (of an image) not being in or brought into focus | Synonyms: unfocused |
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| (adjective) not concentrated at one point or upon one objective | Synonyms: unfocused |
| unforbearing | (adjective) unwilling to endure | - |
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| unforced | (adjective) not resulting from undue effort; not forced | Synonyms: unstrained |
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| (adjective) not brought about by coercion or force | Synonyms: uncoerced, willing |
| unforceful | (adjective) lacking force; feeble | Synonyms: forceless |
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| unforeseeable | (adjective) incapable of being anticipated | - |
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| unforeseen | (adjective) not anticipated | Synonyms: out of the blue, unanticipated, unlooked-for, unseen |
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| unforesightful | (adjective) lacking foresight or scope | Synonyms: myopic, short, shortsighted |
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| unforested | (adjective) not covered with forest | - |
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| unforethoughtful | (adjective) lacking forethought | - |
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| unforfeitable | (adjective) not subject to forfeiture | Synonyms: inalienable |
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| unforgettable | (adjective) impossible to forget | - |
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| unforgivable | (adjective) not excusable | Synonyms: inexcusable |
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| unforgiving | (adjective) unwilling or unable to forgive or show mercy | - |
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| (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, inexorable, relentless, stern, unappeasable, unrelenting |
| unformed | (adjective) not having form or shape | - |
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| (adjective) not formed or organized | - |
| unfortunate | (adjective) not favored by fortune; marked or accompanied by or resulting in ill fortune | - |
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| (adjective) not auspicious; boding ill | Synonyms: inauspicious |
| (adjective) unsuitable or regrettable | - |
| unfounded | (adjective) without a basis in reason or fact | Synonyms: baseless, groundless, idle, unwarranted, wild |
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| unframed | (adjective) not provided with a frame | - |
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| unfree | (adjective) hampered and not free; not able to act at will | - |
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| (adjective) held in servitude | - |
| unfrequented | (adjective) devoid of creatures | Synonyms: lonely, solitary |
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| unfretted | (adjective) without frets | - |
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| unfriendly | (adjective) not disposed to friendship or friendliness | - |
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| (adjective) not easy to understand or use | - |
| (adjective) very unfavorable to life or growth | Synonyms: hostile, uncongenial |
| (adjective) not friendly | Synonyms: inimical |
| unfrightened | (adjective) not affected by fright | - |
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| unfrosted | (adjective) (of glass) lacking a frosted coating | - |
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| unfrozen | (adjective) not frozen | - |
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| unfruitful | (adjective) not fruitful; not conducive to abundant production | - |
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| unfueled | (adjective) not provided with fuel | - |
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| unfulfilled | (adjective) of persons; marked by failure to realize full potentialities | Synonyms: unrealised, unrealized |
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| unfunctional | (adjective) not related to or suitable for everyday needs or activities | - |
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| unfunded | (adjective) not furnished with funds | - |
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| unfunny | (adjective) not funny; especially failing to achieve the intended humor | - |
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| unfurnished | (adjective) not equipped with what is needed especially furniture | - |
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| unfurrowed | (adjective) not marked with shallow depressions or furrows | - |
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