| accidental | (adjective) not of prime or central importance | Synonyms: incidental, nonessential |
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| (adjective) happening by chance or unexpectedly or unintentionally | Synonyms: inadvertent |
| alimental | (adjective) of or providing nourishment | Synonyms: alimentary, nourishing, nutrient, nutritious, nutritive |
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| aplacental | (adjective) having no placenta | - |
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| coincidental | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coinciding, concurrent, cooccurring, simultaneous |
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| compartmental | (adjective) divided up into compartments or categories | Synonyms: compartmentalised, compartmentalized |
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| complemental | (adjective) acting as or providing a complement (something that completes the whole) | Synonyms: complementary, completing |
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| consonantal | (adjective) being or marked by or containing or functioning as a consonant | - |
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| (adjective) relating to or having the nature of a consonant | - |
| continental | (adjective) being or concerning or limited to a continent especially the continents of North America or Europe | - |
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| (adjective) of or relating to or characteristic of a continent | - |
| (adjective) of or relating to or concerning the American colonies during and immediately after the American Revolutionary War | - |
| contrapuntal | (adjective) having two or more independent but harmonically related melodic parts sounding together | Synonyms: polyphonic |
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| (adjective) relating to or characteristic of or according to the rules of counterpoint | - |
| dental | (adjective) of or relating to the teeth | - |
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| (adjective) of or relating to dentistry | - |
| departmental | (adjective) of or relating to a department | - |
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| detrimental | (adjective) (sometimes followed by `to') causing harm or injury | Synonyms: damaging, prejudicial, prejudicious |
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| developmental | (adjective) of or relating to or constituting development | - |
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| documental | (adjective) relating to or consisting of or derived from documents | Synonyms: documentary |
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| edental | (adjective) having few if any teeth | Synonyms: edentate, edentulate |
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| elemental | (adjective) relating to or being an element | - |
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| (adjective) relating to severe atmospheric conditions | - |
| (adjective) of or being the essential or basic part | Synonyms: basal, elementary, primary |
| environmental | (adjective) concerned with the ecological effects of altering the environment | - |
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| (adjective) of or relating to the external conditions or surroundings | - |
| experimental | (adjective) relating to or based on experiment | - |
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| (adjective) relying on observation or experiment | Synonyms: data-based, observational |
| (adjective) of the nature of or undergoing an experiment | - |
| firmamental | (adjective) relating to the firmament or upper regions | - |
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| fragmental | (adjective) consisting of small disconnected parts | Synonyms: fragmentary |
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| frontal | (adjective) of or relating to the front of an advancing mass of air | - |
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| (adjective) meeting front to front | Synonyms: head-on |
| (adjective) belonging to the front part | - |
| (adjective) of or adjacent to the forehead or frontal bone | - |
| fundamental | (adjective) being or involving basic facts or principles | Synonyms: rudimentary, underlying |
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| (adjective) serving as an essential component | Synonyms: cardinal, central, key, primal |
| (adjective) far-reaching and thoroughgoing in effect especially on the nature of something | Synonyms: profound |
| governmental | (adjective) relating to or dealing with the affairs or structure of government or politics or the state | - |
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| horizontal | (adjective) parallel to or in the plane of the horizon or a base line | - |
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| implemental | (adjective) serving or acting as a means or aid | Synonyms: instrumental, subservient |
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| incidental | (adjective) (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence | Synonyms: incident |
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| (adjective) not of prime or central importance | Synonyms: accidental, nonessential |
| (adjective) occurring with or following as a consequence | Synonyms: accompanying, attendant, collateral, concomitant, consequent, ensuant, resultant, sequent |
| incremental | (adjective) increasing gradually by regular degrees or additions | - |
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| instrumental | (adjective) relating to or designed for or performed on musical instruments | - |
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| (adjective) serving or acting as a means or aid | Synonyms: implemental, subservient |
| integumental | (adjective) of or relating to the integument | Synonyms: integumentary |
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| intercontinental | (adjective) extending or taking place between or among continents | - |
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| interdepartmental | (adjective) between or among departments | - |
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| intradepartmental | (adjective) within a department | - |
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| judgmental | (adjective) depending on judgment | - |
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| maxillodental | (adjective) of or relating to the upper jaw and its associated teeth | - |
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| mental | (adjective) involving the mind or an intellectual process | - |
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| (adjective) of or relating to the mind | - |
| (adjective) of or relating to the chin- or liplike structure in insects and certain mollusks | - |
| (adjective) of or relating to the chin or median part of the lower jaw | Synonyms: genial |
| (adjective) affected by a disorder of the mind | - |
| monumental | (adjective) relating or belonging to or serving as a monument | - |
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| (adjective) imposing in size or bulk or solidity | Synonyms: massive, monolithic |
| (adjective) of outstanding significance | - |
| nonjudgmental | (adjective) refraining from making judgments especially ones based on personal opinions or standards | - |
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| nonsegmental | (adjective) having a body that is not divided into segments | Synonyms: unsegmented |
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| occidental | (adjective) denoting or characteristic of countries of Europe and the western hemisphere | Synonyms: Hesperian |
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| oriental | (adjective) denoting or characteristic of countries of the Far East | - |
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| (adjective) denoting or characteristic of countries of Asia; 'oriental civilization' | - |
| ornamental | (adjective) serving an esthetic rather than a useful purpose | Synonyms: cosmetic, decorative |
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| parental | (adjective) relating to or characteristic of or befitting a parent | Synonyms: maternal, paternal |
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| (adjective) designating the generation of organisms from which hybrid offspring are produced | - |
| periodontal | (adjective) of or relating to or involving or practicing periodontics | Synonyms: periodontic |
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| placental | (adjective) pertaining to or having or occurring by means of a placenta | - |
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| plantal | (adjective) of or relating to plants | - |
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| prefrontal | (adjective) anterior to a frontal structure | - |
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| quantal | (adjective) of or relating to a quantum or capable of existing in only one of two states | Synonyms: quantized |
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| regimental | (adjective) belonging to or concerning a regiment | - |
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| rental | (adjective) of or relating to rent | - |
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| (adjective) available to rent or lease | - |
| sacramental | (adjective) of or relating to or involving a sacrament | - |
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| segmental | (adjective) having the body divided into successive metameres or segments, as in earthworms or lobsters | Synonyms: metameric, segmented |
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| (adjective) divided or organized into speech segments or isolable speech sounds | - |
| sentimental | (adjective) effusively or insincerely emotional | Synonyms: bathetic, drippy, hokey, kitschy, maudlin, mawkish, mushy, sappy, schmaltzy, schmalzy, slushy, soppy, soupy |
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| (adjective) given to or marked by sentiment or sentimentality | - |
| supplemental | (adjective) added to complete or make up a deficiency | Synonyms: supplementary |
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| (adjective) functioning in a supporting capacity | Synonyms: auxiliary, subsidiary, supplementary |
| suprasegmental | (adjective) pertaining to a feature of speech that extends over more than a single speech sound | - |
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| temperamental | (adjective) relating to or caused by temperament | - |
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| (adjective) subject to sharply varying moods | Synonyms: moody |
| (adjective) likely to perform unpredictably | Synonyms: erratic |
| transcendental | (adjective) of or characteristic of a system of philosophy emphasizing the intuitive and spiritual above the empirical and material | - |
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| (adjective) existing outside of or not in accordance with nature | Synonyms: nonnatural, otherworldly, preternatural |
| transcontinental | (adjective) spanning or crossing or on the farther side of a continent | - |
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| transplacental | (adjective) occurring through or by way of the placenta | - |
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| unsentimental | (adjective) facing facts or difficulties realistically and with determination | Synonyms: tough-minded |
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| vestmental | (adjective) of or relating to or resembling a vestment | - |
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