| hyperfine | (adjective) extremely fine or thin, as in a spectral line split into two or more components | - |
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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| imperfectible | (adjective) capable of being made imperfect | - |
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| imperforate | (adjective) not perforated; having no opening | - |
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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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| perfervid | (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, impassioned, torrid |
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| perfidious | (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: punic, treacherous |
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| perfoliate | (adjective) (of a leaf) having the base united around (and apparently pierced by) the stem | - |
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| perforate | (adjective) having a hole cut through | Synonyms: perforated, pierced, punctured |
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| perforated | (adjective) having a number or series of holes | - |
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| (adjective) having a hole cut through | Synonyms: perforate, pierced, punctured |
| perfumed | (adjective) having a natural fragrance | Synonyms: odoriferous, odorous, scented, sweet-scented, sweet-smelling, sweet |
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| (adjective) filled or impregnated with perfume | Synonyms: scented |
| 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 |
| pluperfect | (adjective) more than perfect | - |
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| superfatted | (adjective) (of soap) containing extra unsaponified fat | - |
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| superficial | (adjective) concerned with or comprehending only what is apparent or obvious; not deep or penetrating emotionally or intellectually | - |
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| (adjective) of, affecting, or being on or near the surface | - |
| (adjective) hasty and without attention to detail; not thorough | Synonyms: casual, cursory, passing, perfunctory |
| (adjective) of little substance or significance | Synonyms: trivial |
| (adjective) occurring on or near the surface of the skin | - |
| superfine | (adjective) (used especially of merchandise) very fine in quality | - |
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| (adjective) of extremely fine size or texture | - |
| (adjective) excessively delicate or refined | Synonyms: overrefined |
| superfluous | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, supererogatory, supernumerary, surplus |
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| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, purposeless, senseless, wasted |
| unperformed | (adjective) not performed | - |
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