| quack | (adjective) medically unqualified | - |
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| quadrangular | (adjective) of or relating to or shaped like a quadrangle | - |
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| quadraphonic | (adjective) of or relating to quadraphony | Synonyms: quadrasonic, quadriphonic, quadrisonic |
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| quadrasonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadriphonic, quadrisonic |
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| quadrate | (adjective) having four sides and four angles | - |
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| quadratic | (adjective) involving the second and no higher power of a quantity or degree | - |
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| quadrilateral | (adjective) having four sides | Synonyms: four-sided |
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| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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| quadripartite | (adjective) involving four parties | Synonyms: four-party |
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| quadriphonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadrisonic |
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| quadrisonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadriphonic |
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| quadruped | (adjective) having four feet | Synonyms: four-footed, quadrupedal |
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| quadrupedal | (adjective) having four feet | Synonyms: four-footed, quadruped |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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| quaggy | (adjective) (of soil) soft and watery | Synonyms: boggy, marshy, miry, mucky, muddy, sloppy, sloughy, soggy, squashy, swampy, waterlogged |
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| quaint | (adjective) attractively old-fashioned (but not necessarily authentic) | Synonyms: old-time, olde worlde |
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| (adjective) strange in an interesting or pleasing way | - |
| (adjective) very strange or unusual; odd or even incongruous in character or appearance | - |
| qualified | (adjective) meeting the proper standards and requirements and training for an office or position or task | - |
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| (adjective) limited or restricted; not absolute | - |
| (adjective) contingent on something else | Synonyms: dependant, dependent |
| (adjective) restricted in meaning; (as e.g. `man' in `a tall man') | Synonyms: restricted |
| (adjective) holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill | Synonyms: certified |
| qualitative | (adjective) involving distinctions based on qualities | - |
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| (adjective) relating to or involving comparisons based on qualities | - |
| quality | (adjective) of superior grade | Synonyms: choice, prime, prize, select |
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| (adjective) of high social status | - |
| quantal | (adjective) of or relating to a quantum or capable of existing in only one of two states | Synonyms: quantized |
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| quantifiable | (adjective) capable of being quantified | - |
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| quantitative | (adjective) expressible as a quantity or relating to or susceptible of measurement | - |
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| (adjective) (of verse) having a metric system based on relative duration of syllables | - |
| (adjective) relating to the measurement of quantity | - |
| quantized | (adjective) of or relating to a quantum or capable of existing in only one of two states | Synonyms: quantal |
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| quarantined | (adjective) under forced isolation especially for health reasons | Synonyms: isolated |
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| quarrelsome | (adjective) given to quarreling | - |
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| quartan | (adjective) occurring every fourth day (especially the fever and weakness of malaria) | - |
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| quarterly | (adjective) of or relating to or consisting of a quarter | - |
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| quartzose | (adjective) relating to or made of quartz | - |
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| quasi | (adjective) having some resemblance | - |
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| quaternary | (adjective) consisting of or especially arranged in sets of four | Synonyms: quaternate |
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| (adjective) coming next after the third and just before the fifth in position or time or degree or magnitude | Synonyms: 4th, fourth |
| quaternate | (adjective) consisting of or especially arranged in sets of four | Synonyms: quaternary |
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| quavering | (adjective) (of the voice) quivering as from weakness or fear | Synonyms: tremulous |
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