| prim | (adjective) exaggeratedly proper | Synonyms: priggish, prissy, prudish, puritanical, square-toed, straight-laced, straightlaced, strait-laced, straitlaced, tight-laced, victorian |
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| (adjective) affectedly dainty or refined | Synonyms: mincing, niminy-piminy, twee |
| prima | (adjective) indicating the most important performer or role | Synonyms: leading, star, starring, stellar |
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| primaeval | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primal, primeval, primordial |
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| primal | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primaeval, primeval, primordial |
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| (adjective) serving as an essential component | Synonyms: cardinal, central, fundamental, key |
| primary | (adjective) of first rank or importance or value; direct and immediate rather than secondary | - |
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| (adjective) of or being the essential or basic part | Synonyms: basal, elemental, elementary |
| (adjective) most important element | Synonyms: chief, main, master, principal |
| (adjective) not derived from or reducible to something else; basic | - |
| prime | (adjective) of or relating to or being an integer that cannot be factored into other integers | - |
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| (adjective) being at the best stage of development | Synonyms: meridian |
| (adjective) of superior grade | Synonyms: choice, prize, quality, select |
| (adjective) used of the first or originating agent | - |
| (adjective) first in rank or degree | Synonyms: premier |
| primed | (adjective) (usually followed by `to' or `for') on the point of or strongly disposed | Synonyms: fit, set |
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| primeval | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primaeval, primal, primordial |
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| primiparous | (adjective) of or relating to a woman who has given birth only once | - |
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| primitive | (adjective) used of preliterate or tribal or nonindustrial societies | - |
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| (adjective) of or created by one without formal training; simple or naive in style | Synonyms: naive |
| (adjective) little evolved from or characteristic of an earlier ancestral type | Synonyms: archaic |
| (adjective) belonging to an early stage of technical development; characterized by simplicity and (often) crudeness | Synonyms: crude, rude |
| primo | (adjective) the best of its kind | - |
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| primordial | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primaeval, primal, primeval |
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