| adrift | (adjective) afloat on the surface of a body of water | - |
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| (adjective) aimlessly drifting | Synonyms: afloat, aimless, directionless, planless, rudderless, undirected |
| 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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