| deceitful | (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: ambidextrous, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
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| (adjective) involving deception | Synonyms: fallacious, fraudulent |
| deceitfully | (adverb) in a corrupt and deceitful manner | Synonyms: dishonestly, venally |
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| deceitfulness | (noun) the quality of being deceitful | - |
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| defunct | (adjective) having ceased to exist or live | - |
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| (adjective) no longer in force or use; inactive | - |
| defunctness | (noun) no longer in existence | Synonyms: extinction |
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| defuse | (verb) remove the triggering device from | - |
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| defusing | (noun) the act of deactivating or making ineffective (as a bomb) | Synonyms: deactivation |
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| delightful | (adjective) greatly pleasing or entertaining | Synonyms: delicious |
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| delightfully | (adverb) in a delightful manner | - |
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| despiteful | (adjective) showing malicious ill will and a desire to hurt; motivated by spite | Synonyms: spiteful, vindictive |
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| despitefully | (adverb) in a maliciously spiteful manner | Synonyms: spitefully |
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| dessertspoonful | (noun) as much as a dessert spoon will hold | Synonyms: dessertspoon |
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| desulfurize | (verb) remove sulfur from | Synonyms: desulphurize |
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| diffuse | (adjective) (of light) transmitted from a broad light source or reflected | Synonyms: diffused, soft |
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| (adjective) spread out; not concentrated in one place | - |
| (adjective) lacking conciseness | - |
| (verb) cause to become widely known | Synonyms: broadcast, circularise, circularize, circulate, disperse, disseminate, distribute, pass around, propagate, spread |
| (verb) spread or diffuse through | Synonyms: imbue, interpenetrate, penetrate, permeate, pervade, riddle |
| (verb) move outward | Synonyms: fan out, spread, spread out |
| diffused | (adjective) (of light) transmitted from a broad light source or reflected | Synonyms: diffuse, soft |
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| (adjective) (of light rays) subjected to scattering by reflection from a rough surface or transmission through a translucent material | - |
| diffusely | (adverb) in a diffuse manner | - |
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| diffuseness | (noun) the spatial property of being spread out over a wide area or through a large volume | - |
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| diffuser | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffusor |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffusor |
| diffusing | (adjective) spreading by diffusion | Synonyms: diffusive, dispersive, disseminative |
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| diffusion | (noun) the act of dispersing or diffusing something | Synonyms: dispersal, dispersion, dissemination |
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| (noun) the property of being diffused or dispersed | Synonyms: dissemination |
| (noun) the spread of social institutions (and myths and skills) from one society to another | - |
| (noun) (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration | - |
| diffusive | (adjective) spreading by diffusion | Synonyms: diffusing, dispersive, disseminative |
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| diffusor | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffuser |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffuser |
| direful | (adjective) causing fear or dread or terror | Synonyms: awful, dire, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
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| direfully | (adverb) in a direful manner | - |
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| disdainful | (adjective) expressing extreme contempt | Synonyms: contemptuous, insulting, scornful |
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| (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: haughty, imperious, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
| disdainfully | (adverb) without respect; in a disdainful manner | Synonyms: contemptuously, contumeliously, scornfully |
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| (adverb) in a proud and domineering manner | Synonyms: cavalierly |
| disdainfulness | (noun) the trait of displaying arrogance by patronizing those considered inferior | Synonyms: condescension, superciliousness |
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| disfunction | (noun) (medicine) any disturbance in the functioning of an organ or body part or a disturbance in the functioning of a social group | Synonyms: dysfunction |
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| disgraceful | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, ignominious, inglorious, opprobrious, shameful |
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| (adjective) giving offense to moral sensibilities and injurious to reputation | Synonyms: scandalous, shameful, shocking |
| disgracefully | (adverb) in a dishonorable manner or to a dishonorable degree | Synonyms: discreditably, dishonorably, dishonourably, ignominiously, ingloriously, shamefully |
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| disgracefulness | (noun) unworthiness meriting public disgrace and dishonor | Synonyms: ignominiousness, shamefulness |
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| disgustful | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgusting, distasteful, foul, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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| dishful | (noun) the quantity that a dish will hold | Synonyms: dish |
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| disrespectful | (adjective) exhibiting lack of respect; rude and discourteous | - |
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| (adjective) neither feeling nor showing respect | Synonyms: aweless, awless |
| disrespectfully | (adverb) in a disrespectful manner | - |
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| distasteful | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, disgusting, foul, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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| (adjective) not pleasing in odor or taste | Synonyms: unsavory, unsavoury |
| distastefully | (adverb) in a disgusting manner or to a disgusting degree | Synonyms: disgustingly, revoltingly, sickeningly |
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| (adverb) in an offensively distasteful manner | - |
| distastefulness | (noun) the quality of being offensive | Synonyms: odiousness, offensiveness |
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| (noun) extreme unpalatability to the mouth | Synonyms: disgustingness, nauseatingness, sickeningness, unsavoriness |
| distressful | (adjective) causing distress or worry or anxiety | Synonyms: distressing, disturbing, perturbing, troubling, worrisome, worrying |
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| distressfully | (adverb) with distress | - |
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| distressfulness | (noun) the quality of arousing fear or distress | Synonyms: seriousness |
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| distrustful | (adjective) having or showing distrust | - |
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| distrustfully | (adverb) with distrust | Synonyms: mistrustfully |
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| distrustfulness | (noun) the trait of not trusting others | Synonyms: distrust, mistrust |
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| doleful | (adjective) filled with or evoking sadness | Synonyms: mournful |
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| dolefully | (adverb) with sadness; in a sorrowful manner | Synonyms: sorrowfully |
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| dolefulness | (noun) sadness caused by grief or affliction | - |
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| doofus | (noun) a stupid incompetent person | Synonyms: dimwit, half-wit, nitwit |
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| doubtful | (adjective) open to doubt or suspicion | Synonyms: dubious, dubitable, in question |
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| (adjective) fraught with uncertainty or doubt | Synonyms: dubious |
| (adjective) unsettled in mind or opinion | Synonyms: tentative |
| doubtfully | (adverb) in a doubtful manner | Synonyms: dubiously |
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| doubtfulness | (noun) uncertainty about the truth or factuality or existence of something | Synonyms: doubt, dubiousness, question |
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| (noun) the state of being unsure of something | Synonyms: doubt, dubiety, dubiousness, incertitude, uncertainty |
| dreadful | (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, fearful, fearsome, frightening, horrendous, horrific, terrible |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, atrocious, awful, painful, terrible, unspeakable |
| (adjective) extremely disagreeable and unpleasant | - |
| dreadfully | (adverb) of a dreadful kind | Synonyms: awfully, horribly |
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| (adverb) in a dreadful manner | Synonyms: dismally |
| dreadfulness | (noun) a quality of extreme unpleasantness | Synonyms: awfulness, horridness, terribleness |
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| dreamfully | (adverb) in a dreamy manner | Synonyms: dreamily, moonily |
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| dustpanful | (noun) the quantity that a dustpan will hold | Synonyms: dustpan |
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| dutiful | (adjective) willingly obedient out of a sense of duty and respect | Synonyms: duteous |
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| dutifully | (adverb) out of a sense of duty; in a dutiful manner | - |
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| dutifulness | (noun) piety by virtue of devotion to duty | - |
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| dysfunction | (noun) (medicine) any disturbance in the functioning of an organ or body part or a disturbance in the functioning of a social group | Synonyms: disfunction |
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| dysfunctional | (adjective) impaired in function; especially of a bodily system or organ | - |
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| (adjective) (of a trait or condition) failing to serve an adjustive purpose | Synonyms: nonadaptive |
| dysfunctionality | (noun) The condition of functioning incorrectly or abnormally. | - |
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| earful | (noun) a severe scolding | Synonyms: bawling out, castigation, chewing out, dressing down, going-over, upbraiding |
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| (noun) an outpouring of gossip | - |
| effortful | (adjective) requiring great physical effort | - |
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| effortfulness | (noun) the quality of requiring deliberate effort | - |
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| effulgence | (noun) the quality of being bright and sending out rays of light | Synonyms: radiance, radiancy, refulgence, refulgency, shine |
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| effulgent | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, radiant, refulgent |
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| effuse | (verb) give out or emit (also metaphorically) | - |
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| (verb) flow or spill forth | Synonyms: flow out |
| (verb) pour out liberally | Synonyms: pour out |
| effusion | (noun) flow under pressure | - |
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| (noun) an unrestrained expression of emotion | Synonyms: blowup, ebullition, gush, outburst |
| effusive | (adjective) extravagantly demonstrative | Synonyms: gushing, gushy |
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| (adjective) uttered with unrestrained enthusiasm | Synonyms: burbling, burbly, gushing |
| effusively | (adverb) in an effusive manner | - |
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| effusiveness | (noun) a friendly open trait of a talkative person | Synonyms: expansiveness, expansivity |
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| eventful | (adjective) full of events or incidents | - |
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| (adjective) having important issues or results | Synonyms: consequential |
| eyeful | (noun) a full view; a good look | - |
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| (noun) a strikingly beautiful woman | - |
| faithful | (adjective) steadfast in affection or allegiance | - |
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| (adjective) not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) marked by fidelity to an original | Synonyms: close |
| (noun) a group of people who adhere to a common faith and habitually attend a given church | Synonyms: congregation, fold |
| (noun) any loyal and steadfast following | - |
| faithfully | (adverb) in a faithful manner | Synonyms: dependably, reliably |
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| faithfulness | (noun) the quality of being faithful | Synonyms: fidelity |
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| fanciful | (adjective) indulging in or influenced by fancy | Synonyms: notional |
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| (adjective) having a curiously intricate quality | - |
| (adjective) not based on fact; existing only in the imagination | Synonyms: imaginary, notional |
| fancifully | (adverb) in a fanciful manner | Synonyms: whimsically |
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| fateful | (adjective) having momentous consequences; of decisive importance | Synonyms: fatal |
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| (adjective) controlled or decreed by fate; predetermined | Synonyms: fatal |
| (adjective) ominously prophetic | Synonyms: foreboding, portentous |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, calamitous, disastrous, fatal |
| fatefully | (adverb) in a prophetically fateful manner | - |
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| fearful | (adjective) lacking courage; ignobly timid and faint-hearted | Synonyms: cowardly |
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| (adjective) experiencing or showing fear | - |
| (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearsome, frightening, horrendous, horrific, terrible |
| (adjective) extremely distressing | Synonyms: frightful |
| (adjective) timid by nature or revealing timidity | Synonyms: timorous, trepid |
| fearfully | (adverb) in fear | - |
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| (adverb) in an alarming manner | - |
| fearfulness | (noun) the trait of being afraid | - |
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| (noun) an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight) | Synonyms: fear, fright |
| febrifuge | (noun) any medicine that lowers body temperature to prevent or alleviate fever | Synonyms: antipyretic |
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| fistful | (noun) the quantity that can be held in the hand | Synonyms: handful |
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| fitful | (adjective) intermittently stopping and starting | Synonyms: interrupted, off-and-on |
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| (adjective) occurring in spells and often abruptly | Synonyms: spasmodic |
| fitfully | (adverb) in a fitful manner | - |
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| fitfulness | (noun) the quality of being spasmodic and irregular | Synonyms: jerkiness |
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| flaskful | (noun) the quantity a flask will hold | Synonyms: flask |
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| flavorful | (adjective) full of flavor | Synonyms: flavorous, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavourful | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourous, flavoursome, sapid, saporous |
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| forceful | (adjective) characterized by or full of force or strength (often but not necessarily physical) | - |
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| (adjective) forceful and definite in expression or action | Synonyms: emphatic |
| forcefully | (adverb) with full force | - |
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| forcefulness | (noun) physical energy or intensity | Synonyms: force, strength |
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| foresightful | (adjective) planning prudently for the future | Synonyms: farseeing, farsighted, foresighted, long, longsighted, prospicient |
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| foresightfulness | (noun) providence by virtue of planning prudently for the future | Synonyms: foresight, foresightedness |
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| forethoughtful | (adjective) thoughtful of the future | - |
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| forgetful | (adjective) (of memory) deficient in retentiveness or range | Synonyms: short, unretentive |
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| (adjective) not mindful or attentive | Synonyms: mindless, unmindful |
| (adjective) failing to keep in mind | Synonyms: oblivious |
| forgetfully | (adverb) in a forgetful manner | - |
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