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quack (n) : someone who pretends to have knowledge or skill that he or she does not really have
quagmire (n) : a difficult position; it can also mean wet, boggy ground
quaint (adj) : charmingly old-fashioned or unusual in character
quandary (n) : an uncertain and confusing situation or position
quarantine (n) : an isolation or restriction placed upon individuals or things so to stop a disease from spreading
quasi (adj) : having some similarities; it is often hyphenated as a prefix to a noun, adjective, or adverb
queasy (adj) : causing or being affected by nausea or feeling discomfort
quell (v) : to put an end to or to quiet something
quiescent (adj) : to become quiet or still
quintessence (n) : the pure, concentrated essence of anything or the most perfect quality of a thing
quirk (n) : a peculiar trait or mannerism; it can also mean a sudden twist or turn
quixotic (adj) : extravagantly romantic, or foolishly idealistic or unrealistic
quizzical (adj) : odd, comical, or puzzling
quorum (n) : the minimum number of members required to be present at a meeting before it can validly conduct business
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GRE and SAT Vocabulary Words