| practical | (adjective) concerned with actual use or practice | - |
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| (adjective) having or put to a practical purpose or use | - |
| (adjective) guided by practical experience and observation rather than theory | Synonyms: hard-nosed, hardheaded, pragmatic |
| (adjective) being actually such in almost every respect | Synonyms: virtual |
| practiced | (adjective) skillful after much practice | Synonyms: practised |
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| (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, expert, good, proficient, skilful, skillful |
| practised | (adjective) skillful after much practice | Synonyms: practiced |
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| predictable | (adjective) capable of being foretold | - |
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| predictive | (adjective) of or relating to prediction; having value for making predictions | Synonyms: prognostic, prognosticative |
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| prefectural | (adjective) of or relating to a prefecture | - |
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| proactive | (adjective) descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently | - |
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| (adjective) (of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens | - |
| productive | (adjective) producing or capable of producing (especially abundantly) | - |
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| (adjective) having the ability to produce or originate | Synonyms: generative |
| (adjective) marked by great fruitfulness | Synonyms: fat, fertile, rich |
| (adjective) yielding positive results | - |
| projected | (adjective) extending out above or beyond a surface or boundary | Synonyms: jutting, projecting, protruding, relieved, sticking, sticking out |
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| projectile | (adjective) impelling or impelled forward | - |
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| projecting | (adjective) extending out above or beyond a surface or boundary | Synonyms: jutting, projected, protruding, relieved, sticking, sticking out |
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| prophylactic | (adjective) preventing or contributing to the prevention of disease | Synonyms: preventative, preventive |
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| (adjective) warding off | Synonyms: cautionary |
| (adjective) capable of preventing conception or impregnation | Synonyms: antifertility, contraceptive |
| prospective | (adjective) of or concerned with or related to the future | - |
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| protected | (adjective) kept safe or defended from danger or injury or loss | - |
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| (adjective) guarded from injury or destruction | Synonyms: saved |
| protecting | (adjective) shielding (or designed to shield) against harm or discomfort | - |
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| protective | (adjective) intended or adapted to afford protection of some kind | - |
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| (adjective) showing care | - |
| (adjective) (usually followed by `of') solicitously caring or mindful | - |
| protracted | (adjective) relatively long in duration; tediously protracted | Synonyms: drawn-out, extended, lengthy, prolonged |
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| protractible | (adjective) able to be extended | Synonyms: protractile |
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| protractile | (adjective) able to be extended | Synonyms: protractible |
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| psychoactive | (adjective) affecting the mind or mood or other mental processes | Synonyms: psychotropic |
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| punctilious | (adjective) marked by precise accordance with details | Synonyms: meticulous |
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| punctual | (adjective) acting or arriving or performed exactly at the time appointed | Synonyms: on time |
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| puncturable | (adjective) capable of being punctured | - |
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| punctured | (adjective) having a hole cut through | Synonyms: perforate, perforated, pierced |
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| punctureless | (adjective) being without punctures or incapable of being punctured | - |
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| putrefactive | (adjective) causing or promoting bacterial putrefaction | Synonyms: putrefacient |
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| pyrectic | (adjective) having or causing fever | - |
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| pyroelectric | (adjective) relating to or exhibiting pyroelectricity | Synonyms: pyroelectrical |
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| pyroelectrical | (adjective) relating to or exhibiting pyroelectricity | Synonyms: pyroelectric |
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| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| rambunctious | (adjective) noisy and lacking in restraint or discipline | Synonyms: boisterous, robustious, rumbustious, unruly |
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| reactionary | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionist |
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| reactionist | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionary |
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| reactive | (adjective) participating readily in reactions | - |
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| (adjective) reacting to a stimulus | Synonyms: responsive |
| recollective | (adjective) good at remembering | Synonyms: long, retentive, tenacious |
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| reconstructed | (adjective) adapted to social or economic change | - |
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| reconstructive | (adjective) helping to restore to good condition | Synonyms: rehabilitative |
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| rectal | (adjective) of or involving the rectum | - |
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| rectangular | (adjective) having four right angles | - |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: orthogonal |
| rectifiable | (adjective) capable of being repaired or rectified | Synonyms: reparable |
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| rectified | (adjective) having been put right | - |
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| rectilineal | (adjective) characterized by a straight line or lines | Synonyms: rectilinear |
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| rectilinear | (adjective) characterized by a straight line or lines | Synonyms: rectilineal |
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| rectosigmoid | (adjective) of or related to or near the sigmoid colon and the upper part of the rectum | - |
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| reductionist | (adjective) of or relating to the theory of reductionism | - |
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| reductive | (adjective) characterized by or causing diminution or curtailment | - |
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| reflected | (adjective) (especially of incident sound or light) bent or sent back | - |
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| reflecting | (adjective) causing reflection or having a device that reflects | - |
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| reflective | (adjective) capable of physically reflecting light or sound | - |
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| (adjective) devoted to matters of the mind | - |
| (adjective) deeply or seriously thoughtful | Synonyms: brooding, broody, contemplative, meditative, musing, pensive, pondering, ruminative |
| refractile | (adjective) of or relating to or capable of refraction | Synonyms: refractive |
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| refractive | (adjective) of or relating to or capable of refraction | Synonyms: refractile |
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| (adjective) capable of changing the direction (of a light or sound wave) | Synonyms: deflective |
| refractory | (adjective) stubbornly resistant to authority or control | Synonyms: fractious, recalcitrant |
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| (adjective) temporarily unresponsive or not fully responsive to a process or stimulus | - |
| (adjective) not responding to treatment | Synonyms: stubborn |
| rejected | (adjective) rebuffed (by a lover) without warning | Synonyms: jilted, spurned |
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| rejective | (adjective) rejecting or tending to reject | - |
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| reluctant | (adjective) disinclined to become involved | - |
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| (adjective) not eager | - |
| (adjective) unwillingness to do something contrary to your custom | Synonyms: loath, loth |
| reproductive | (adjective) producing new life or offspring | Synonyms: generative, procreative |
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| respectable | (adjective) characterized by socially or conventionally acceptable morals | - |
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| (adjective) large in amount or extent or degree | Synonyms: goodish, goodly, healthy, hefty, sizable, sizeable, tidy |
| (adjective) deserving of esteem and respect | Synonyms: admirable, estimable, good, honorable |
| respected | (adjective) receiving deferential regard | Synonyms: well-thought-of |
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| respectful | (adjective) full of or exhibiting respect | - |
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| (adjective) feeling or manifesting veneration | Synonyms: reverential, venerating |
| respective | (adjective) considered individually | Synonyms: several, various |
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| restricted | (adjective) subject to restriction or subjected to restriction | - |
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| (adjective) the lowest level of official classification for documents | - |
| (adjective) restricted in meaning; (as e.g. `man' in `a tall man') | Synonyms: qualified |
| restricting | (adjective) restricting the scope or freedom of action | Synonyms: confining, constraining, constrictive, limiting |
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| restrictive | (adjective) serving to restrict | - |
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| (adjective) (of tariff) protective of national interests by restricting imports | - |
| retractable | (adjective) capable of being retracted | - |
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| retracted | (adjective) drawn back and in | - |
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| retractile | (adjective) capable of retraction; capable of being drawn back | - |
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| retroactive | (adjective) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously | - |
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| (adjective) affecting things past | Synonyms: ex post facto, retro |
| retrospective | (adjective) concerned with or related to the past | - |
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| sacrosanct | (adjective) must be kept sacred | Synonyms: inviolable, inviolate |
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| sanctified | (adjective) made or declared or believed to be holy; devoted to a deity or some religious ceremony or use | Synonyms: consecrated, sacred |
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| sanctimonious | (adjective) excessively or hypocritically pious | Synonyms: holier-than-thou, pharisaic, pharisaical, pietistic, pietistical, self-righteous |
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| sanctionative | (adjective) implying sanction or serving to sanction | Synonyms: sanctioning |
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| sanctioned | (adjective) established by authority; given authoritative approval | Synonyms: approved |
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| (adjective) formally approved and invested with legal authority | Synonyms: ratified |
| (adjective) conforming to orthodox or recognized rules | Synonyms: canonic, canonical |
| sanctioning | (adjective) implying sanction or serving to sanction | Synonyms: sanctionative |
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| satisfactory | (adjective) giving satisfaction | - |
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| (adjective) meeting requirements | Synonyms: acceptable, decent |
| sectarian | (adjective) of or relating to or characteristic of a sect or sects | - |
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| sectional | (adjective) relating to or based upon a section (i.e. as if cut through by an intersecting plane) | - |
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| (adjective) consisting of or divided into sections | Synonyms: sectioned |
| (adjective) related or limited to a distinct region or subdivision of a territory or community or group of people | - |
| sectioned | (adjective) consisting of or divided into sections | Synonyms: sectional |
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| sectorial | (adjective) relating to or resembling a sector | - |
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| seductive | (adjective) tending to entice into a desired action or state | - |
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| select | (adjective) selected or chosen for special qualifications | Synonyms: blue-ribbon |
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| (adjective) of superior grade | Synonyms: choice, prime, prize, quality |
| selected | (adjective) chosen in preference to another | - |
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| selective | (adjective) tending to select; characterized by careful choice | - |
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| (adjective) characterized by very careful or fastidious selection | - |
| semiabstract | (adjective) characterized by stylized but recognizable subject matter | - |
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| semiconducting | (adjective) having characteristics of a semiconductor; that is having electrical conductivity greater than insulators but less than good conductors | Synonyms: semiconductive |
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| semiconductive | (adjective) having characteristics of a semiconductor; that is having electrical conductivity greater than insulators but less than good conductors | Synonyms: semiconducting |
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| spectacled | (adjective) wearing, or having the face adorned with, eyeglasses or an eyeglass | Synonyms: bespectacled, monocled |
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| spectacular | (adjective) having a quality that thrusts itself into attention | Synonyms: outstanding, prominent, salient, striking |
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| (adjective) characteristic of spectacles or drama | - |
| (adjective) sensational in appearance or thrilling in effect | Synonyms: dramatic, striking |
| spectral | (adjective) of or relating to a spectrum | - |
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| (adjective) resembling or characteristic of a phantom | Synonyms: apparitional, ghostlike, ghostly, phantasmal, spiritual |
| spectrographic | (adjective) relating to or employing a spectrograph | - |
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| spectrometric | (adjective) of or relating to or involving spectrometry | - |
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| spectroscopic | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopical |
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| spectroscopical | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopic |
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| strict | (adjective) characterized by strictness, severity, or restraint | Synonyms: nonindulgent |
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| (adjective) severe and unremitting in making demands | Synonyms: exacting, stern |
| (adjective) rigidly accurate; allowing no deviation from a standard | Synonyms: rigorous |
| (adjective) incapable of compromise or flexibility | Synonyms: rigid |
| (adjective) (of rules) stringently enforced | Synonyms: hard-and-fast |
| structural | (adjective) relating to or having or characterized by structure | - |
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| (adjective) relating to or caused by structure, especially political or economic structure | - |
| (adjective) relating to or concerned with the morphology of plants and animals | Synonyms: morphologic, morphological |
| (adjective) pertaining to geological structure | Synonyms: geomorphologic, geomorphological, morphologic, morphological |
| (adjective) concerned with systematic structure in a particular field of study | - |
| (adjective) affecting or involved in structure or construction | - |
| structured | (adjective) having definite and highly organized structure | - |
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| (adjective) resembling a living organism in organization or development | Synonyms: integrated |
| subarctic | (adjective) of or relating to latitudes just south of the Arctic Circle | - |
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| subject | (adjective) likely to be affected by something | - |
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| (adjective) being under the power or sovereignty of another or others | Synonyms: dependent |
| (adjective) possibly accepting or permitting | Synonyms: capable, open |
| subjective | (adjective) taking place within the mind and modified by individual bias | - |
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| (adjective) of a mental act performed entirely within the mind | Synonyms: immanent |
| subjunctive | (adjective) relating to a mood of verbs | - |
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