All terms in this list:

quack: An untrained doctor - pretender to any skill

quaff: To drink in large qualities

quagmire: A perilous, mixed up and troubled situation; a hopeless tangle; a predicament / a swamp

quail: To shrink or waver; to become fearful or doubtful.

qualm: A sickly feeling of being ill at ease; sudden queasiness.

quandry: a puzzling situation, a dilemma

quarry: an animal that is hunted down

quasi: resembling or having a likeness to something

quay: A stone or concrete structure on navigable water used for loading and unloading vessels; a wharf.

querulous: Often complaining; suggesting a complaint in expression; fretful, whining.

queue: A line of people, vehicles or other objects, in which one at the front end is dealt with first, the one behind is dealt with next, and so on, and which newcomers join at the opposite end (the back).

query: A question or inquiry.

quiddity: essential quality

quidnunc: a gossip or busybody

quiescent: Inactive, at rest, quiet.

quietus: finishing stroke, anything that ends an activity

quintessence: A pure substance.

quip: A smart, sarcastic turn or jest; a taunt; a severe retort; a gibe.

quixotic: Possessing or acting with the desire to do noble and romantic deeds, without thought of realism and practicality.

quotidian: daily; occurring or recurring every day.