| 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 |
| (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect tense, progressive, progressive tense |
| imperfectibility | (noun) the capability of becoming imperfect | - |
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| imperfectible | (adjective) capable of being made imperfect | - |
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| imperfection | (noun) the state or an instance of being imperfect | Synonyms: imperfectness |
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| imperfective | (noun) aspect without regard to the beginning or completion of the action of the verb | Synonyms: imperfective aspect |
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| imperfectly | (adverb) in an imperfect or faulty way | Synonyms: amiss |
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| imperfectness | (noun) the state or an instance of being imperfect | Synonyms: imperfection |
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| imperforate | (adjective) not perforated; having no opening | - |
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| nonperformance | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, negligence |
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| outperform | (verb) be or do something to a greater degree | Synonyms: exceed, outdo, outgo, outmatch, outstrip, surmount, surpass |
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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 |
| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
| (verb) make perfect or complete | Synonyms: hone |
| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfected | (adjective) (of plans, ideas, etc.) perfectly formed | - |
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| perfecter | (noun) a skilled worker who perfects something | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| perfectible | (adjective) capable of becoming or being made perfect | - |
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| perfection | (noun) the act of making something perfect | - |
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| (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, paragon |
| (noun) the state of being without a flaw or defect | Synonyms: flawlessness, ne plus ultra |
| perfectionism | (noun) a disposition to feel that anything less than perfect is unacceptable | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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| perfective | (noun) the aspect of a verb that expresses a completed action | Synonyms: perfective aspect |
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| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect, perfect tense, perfective tense |
| perfectly | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, dead, utterly |
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| (adverb) in a perfect or faultless way | - |
| 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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| perfidiously | (adverb) in a perfidious manner | - |
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| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perfidy | (noun) an act of deliberate betrayal | Synonyms: betrayal, treachery, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, treachery |
| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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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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| (verb) make a hole into or between, as for ease of separation | Synonyms: punch |
| (verb) pass into or through, often by overcoming resistance | Synonyms: penetrate |
| perforated | (adjective) having a number or series of holes | - |
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| (adjective) having a hole cut through | Synonyms: perforate, pierced, punctured |
| perforation | (noun) the act of punching a hole (especially a row of holes as for ease of separation) | - |
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| (noun) a line of small holes for tearing at a particular place | - |
| (noun) a hole made in something | - |
| perforce | (adverb) by necessity; by force of circumstance | - |
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| perform | (verb) carry out or perform an action | Synonyms: do, execute |
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| (verb) give a performance (of something) | - |
| (verb) get (something) done | Synonyms: do |
| (verb) perform a function | - |
| performance | (noun) the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it | Synonyms: carrying into action, carrying out, execution |
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| (noun) the act of presenting a play or a piece of music or other entertainment | - |
| (noun) any recognized accomplishment | - |
| (noun) a dramatic or musical entertainment | Synonyms: public presentation |
| (noun) process or manner of functioning or operating | Synonyms: functioning, operation |
| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| performing | (noun) the performance of a part or role in a drama | Synonyms: acting, playacting, playing |
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| perfume | (noun) a toiletry that emits and diffuses a fragrant odor | Synonyms: essence |
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| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, scent |
| (verb) apply perfume to | Synonyms: scent |
| (verb) fill or impregnate with an odor | Synonyms: aromatise, aromatize |
| 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 |
| perfumer | (noun) a person who makes (and sells) perfumes | - |
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| perfumery | (noun) the art of making perfumes | - |
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| (noun) an establishment where perfumes are made | - |
| (noun) store where perfumes are sold | - |
| (noun) perfumes in general | - |
| perfunctorily | (adverb) in a set manner without serious attention; as a formality | Synonyms: pro forma |
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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 |
| perfuse | (verb) cause to spread or flush or flood through, over, or across | Synonyms: suffuse |
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| (verb) force a fluid through (a body part or tissue) | - |
| perfusion | (noun) pumping a liquid into an organ or tissue (especially by way of blood vessels) | - |
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| pluperfect | (adjective) more than perfect | - |
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| (noun) a perfective tense used to express action completed in the past | Synonyms: past perfect, past perfect tense, pluperfect tense |
| superfamily | (noun) (biology) a taxonomic group ranking below an order but above a family | - |
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| superfatted | (adjective) (of soap) containing extra unsaponified fat | - |
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| superfecta | (noun) a bet that you can pick the first four finishers in a race in the right order | - |
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| superfecundation | (noun) fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males) | - |
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| superfetate | (verb) conceive when a fetus is already present in the uterus | - |
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| superfetation | (noun) fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time | - |
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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 | - |
| superficiality | (noun) lack of depth of knowledge or thought or feeling | Synonyms: shallowness |
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| (noun) shallowness in terms of affecting only surface layers of something | - |
| superficially | (adverb) in a superficial manner | - |
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| superficies | (noun) outer surface of an area or a body | - |
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| (noun) the purely external aspect of a thing; superficial appearance | - |
| 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 |
| superfluity | (noun) extreme excess | Synonyms: embarrassment, overplus, plethora |
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| 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 |
| superfluously | (adverb) in a superfluous manner | - |
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| superfood | (noun) a food with health benefits | - |
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| underperform | (verb) perform too rarely | - |
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| (verb) perform less well or with less success than expected | Synonyms: underachieve |
| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |
| unperformed | (adjective) not performed | - |
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