| insectan | (adjective) of or relating to the class Insecta | - |
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| insecticidal | (adjective) of or relating to insecticide | - |
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| insectivorous | (adjective) (of animals and plants) feeding on insects | - |
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| instinct | (adjective) (followed by `with') deeply filled or permeated | Synonyms: imbued, replete |
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| instinctive | (adjective) unthinking; prompted by (or as if by) instinct | Synonyms: natural |
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| instructional | (adjective) of or relating to or used in instruction | - |
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| instructive | (adjective) serving to instruct or enlighten or inform | Synonyms: informative |
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| insurrectional | (adjective) of or relating to or given to insurrection | Synonyms: insurrectionary |
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| insurrectionary | (adjective) of or relating to or given to insurrection | Synonyms: insurrectional |
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| intact | (adjective) (used of domestic animals) sexually competent | Synonyms: entire |
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| (adjective) undamaged in any way | - |
| (adjective) (of a woman) having the hymen unbroken | Synonyms: inviolate |
| (adjective) constituting the undiminished entirety; lacking nothing essential especially not damaged | Synonyms: entire, integral |
| intellectual | (adjective) appealing to or using the intellect | - |
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| (adjective) involving intelligence rather than emotions or instinct | Synonyms: cerebral |
| (adjective) of or associated with or requiring the use of the mind | Synonyms: noetic, rational |
| interactional | (adjective) capable of acting on or influencing each other | Synonyms: interactive |
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| interactive | (adjective) used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) | Synonyms: synergistic |
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| (adjective) capable of acting on or influencing each other | Synonyms: interactional |
| interconnected | (adjective) operating as a unit | Synonyms: co-ordinated, coordinated, unified |
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| (adjective) reciprocally connected | Synonyms: interrelated |
| intergalactic | (adjective) between or among galaxies | - |
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| intersectant | (adjective) crossed or intersected in the form of an X | Synonyms: decussate, intersecting |
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| intersecting | (adjective) crossed or intersected in the form of an X | Synonyms: decussate, intersectant |
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| intractable | (adjective) not tractable; difficult to manage or mold | - |
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| introductory | (adjective) serving as a base or starting point | Synonyms: basic |
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| (adjective) serving to open or begin | - |
| (adjective) serving as an introduction or preface | Synonyms: prefatorial, prefatory |
| introjected | (adjective) incorporated unconsciously into your own psyche | - |
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| introspective | (adjective) given to examining own sensory and perceptual experiences | Synonyms: introverted, self-examining |
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| jurisdictional | (adjective) restricted to the geographic area under a particular jurisdiction | - |
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| lactating | (adjective) producing or secreting milk | Synonyms: wet |
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| lacteal | (adjective) relating to or consisting of or producing or resembling milk | - |
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| lactic | (adjective) of or relating to or obtained from milk (especially sour milk or whey) | - |
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| lactogenic | (adjective) inducing lactation | - |
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| maledict | (adjective) under a curse | Synonyms: accursed, accurst |
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| malfunctioning | (adjective) not performing or able to perform its regular function | Synonyms: nonfunctional |
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| manufactured | (adjective) produced in a large-scale industrial operation | - |
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| microelectronic | (adjective) of or relating to or consisting of miniature electronic components | - |
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| multifactorial | (adjective) involving or depending on several factors or causes (especially pertaining to a condition or disease resulting from the interaction of many genes) | - |
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| nectariferous | (adjective) possessing nectaries | - |
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| nectarous | (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosial, ambrosian |
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| neglected | (adjective) lacking a caretaker | Synonyms: unattended |
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| (adjective) disregarded | Synonyms: ignored, unheeded |
| neglectful | (adjective) failing in what duty requires | Synonyms: delinquent, derelict, remiss |
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| (adjective) not showing due care or attention | Synonyms: inattentive |
| noctilucent | (adjective) shining or glowing by night | - |
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| nocturnal | (adjective) belonging to or active during the night | - |
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| (adjective) of or relating to or occurring in the night | - |
| nonaddictive | (adjective) not causing or characterized by addiction | - |
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| nonconducting | (adjective) not able to conduct heat or electricity or sound | Synonyms: non-conducting, nonconductive |
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| nonconductive | (adjective) not able to conduct heat or electricity or sound | Synonyms: non-conducting, nonconducting |
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| nondeductible | (adjective) not allowable as a deduction | - |
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| nonelected | (adjective) filled by appointment rather than by election | Synonyms: non-elective, nonelective |
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| nonelective | (adjective) filled by appointment rather than by election | Synonyms: non-elective, nonelected |
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| nonfictional | (adjective) not fictional | - |
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| nonfunctional | (adjective) not having or performing a function | - |
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| (adjective) not performing or able to perform its regular function | Synonyms: malfunctioning |
| noninfectious | (adjective) not infectious | - |
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| nonintellectual | (adjective) not intellectual | - |
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| nonintersecting | (adjective) (of lines, planes, or surfaces) never meeting or crossing | Synonyms: nonconvergent |
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| nonobjective | (adjective) not representing or imitating external reality or the objects of nature | Synonyms: abstract, abstractionist, nonfigurative |
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| nonproductive | (adjective) not directly productive | - |
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| nonprotractile | (adjective) not extensile | Synonyms: inextensible, nonextensile |
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| nonpsychoactive | (adjective) not affecting the mind or mental processes | - |
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| nonradioactive | (adjective) not radioactive | - |
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| nonreflecting | (adjective) not capable of physical reflection | Synonyms: nonreflective |
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| nonreflective | (adjective) not capable of physical reflection | Synonyms: nonreflecting |
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| nonrestrictive | (adjective) not limiting the reference of a modified word or phrase | - |
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| nonretractable | (adjective) not capable of being retracted | Synonyms: nonretractile |
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| nonretractile | (adjective) not capable of being retracted | Synonyms: nonretractable |
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| nonsectarian | (adjective) not restricted to one sect or school or party | Synonyms: unsectarian |
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| nonstructural | (adjective) not structural | - |
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| nonsubjective | (adjective) undistorted by emotion or personal bias; based on observable phenomena | Synonyms: objective |
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| objectionable | (adjective) causing disapproval or protest | Synonyms: obnoxious |
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| (adjective) liable to objection or debate; used of something one might take exception to | Synonyms: exceptionable |
| objective | (adjective) undistorted by emotion or personal bias; based on observable phenomena | Synonyms: nonsubjective |
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| (adjective) serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes | Synonyms: accusative |
| (adjective) belonging to immediate experience of actual things or events | - |
| (adjective) emphasizing or expressing things as perceived without distortion of personal feelings or interpretation | - |
| obstructed | (adjective) shut off to passage or view or hindered from action | - |
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| obstructive | (adjective) preventing movement | Synonyms: clogging, hindering, impeding |
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| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
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| octal | (adjective) of or pertaining to a number system having 8 as its base | - |
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| octangular | (adjective) of or relating to or shaped like an octagon | Synonyms: octagonal |
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| octogenarian | (adjective) being from 80 to 89 years old | - |
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| octosyllabic | (adjective) having or characterized by or consisting of eight syllables | - |
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| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |
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| olfactive | (adjective) of or relating to olfaction | Synonyms: olfactory |
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| olfactory | (adjective) of or relating to olfaction | Synonyms: olfactive |
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| omnidirectional | (adjective) not directional | - |
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| overactive | (adjective) more active than normal | Synonyms: hyperactive |
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| overprotective | (adjective) overly protective | - |
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| pectic | (adjective) of or relating to or derived from pectin | - |
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| pectinate | (adjective) like a comb | - |
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| pectineal | (adjective) of or relating to the pubis | - |
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| pectoral | (adjective) of or relating to the chest or thorax | Synonyms: thoracic |
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| perfect | (adjective) being complete of its kind and without defect or blemish | - |
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| (adjective) precisely accurate or exact | - |
| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter |
| perfected | (adjective) (of plans, ideas, etc.) perfectly formed | - |
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| perfectible | (adjective) capable of becoming or being made perfect | - |
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| perfunctory | (adjective) hasty and without attention to detail; not thorough | Synonyms: casual, cursory, passing, superficial |
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| (adjective) done or produced as a formality only | Synonyms: pro forma |
| photoconductive | (adjective) of or relating to photoconductivity | - |
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| photoelectric | (adjective) of or pertaining to photoelectricity | Synonyms: photoelectrical |
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| photoelectrical | (adjective) of or pertaining to photoelectricity | Synonyms: photoelectric |
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| pictographic | (adjective) consisting of or characterized by the use of pictographs | - |
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| pictorial | (adjective) pertaining to or consisting of pictures | Synonyms: pictural |
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| (adjective) evoking lifelike images within the mind | Synonyms: graphic, lifelike, vivid |
| pictural | (adjective) pertaining to or consisting of pictures | Synonyms: pictorial |
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| pictured | (adjective) represented graphically by sketch or design or lines | Synonyms: depicted, portrayed |
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| (adjective) seen in the mind as a mental image | Synonyms: envisioned, visualised, visualized |
| picturesque | (adjective) suggesting or suitable for a picture; pretty as a picture | - |
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| (adjective) strikingly expressive | - |
| piezoelectric | (adjective) relating to or involving piezoelectricity | - |
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| pinnatisect | (adjective) (of a leaf shape) cleft nearly to the midrib in narrow divisions not separated into distinct leaflets | - |
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| pluperfect | (adjective) more than perfect | - |
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| polydactyl | (adjective) of or relating to a person (or other vertebrate) having more than the normal number of digits | Synonyms: polydactylous |
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| polydactylous | (adjective) of or relating to a person (or other vertebrate) having more than the normal number of digits | Synonyms: polydactyl |
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| postdoctoral | (adjective) of or relating to study or research that is done after work for the doctoral degree has been completed | - |
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| postictal | (adjective) pertaining to the period following a seizure or convulsion | - |
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| practicable | (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, feasible, viable, workable |
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| (adjective) usable for a specific purpose | Synonyms: operable |