quack quad quadrangle quadriceps quadrilateral quadriplegia quadriplegic quadruple quads quagmire quail quaint quake Quaker quaking qualification qualified qualify quality quandary quant quantity quarantine quark quarrel quarrelsome quarry quart quarter quarterback quarterdeck quartet quasi quatrain quaver quay queasy Quechua queen queer queerness quell quench querulous quest question questionable questioning queue quibble quick quick-tempered quick-witted quicker quickie quickly quicksand quickstep quid quiet quietly quiff quilt quintet quit quite quiver quiz quizmaster quorate quorum quotation quote Qur’an