*quagmire \KWAG-myr; KWOG-\ (noun) –
1 : Soft, wet, miry land that shakes or yields under the feet.
2 : A difficult or precarious position or situation; a predicament.
"Over the course of several months, Franklin’s opponent Slowly and inevitably drew him into a quagmire of plot and counterplot."
Quagmire is from quag, a dialectical variant of quake (from Old English cwacian) + mire, from Old Norse myrr, "a swamp."
querulous \KWER-uh-luhs; -yuh\ (adjective) –
1 : Apt to find fault; habitually complaining.
2 : Expressing complaint; fretful; whining.
"For a younger man, he suddenly sounded like a querulous uncle. Or how she’d imagined a querulous uncle would sound." — Anne Bishop, ‘Belladonna’
Querulous comes from Latin querulus, from queri, "to complain."
quidnunc \KWID-nuhngk\ (noun) – One who is curious to know everything that passes; one who knows or pretends to know all that is going on; a gossip; a busybody.
"What a treasure-trove to these venerable quidnuncs, could they have guessed the secret which Hepzibah and Clifford were carrying along with them!" — Nathaniel Hawthorne, The House of the Seven Gables
Quidnunc comes from Latin quid nunc?, "what now?"
quietus \kwy-EE-tuhs\ (noun) –
1 : A final stroke that settles something.
2 : Discharge from life; death.
3 : A release from a duty or debt.
"The irony was, as Lucinda saw it, that her family’s curse would provide its own quietus and lead her to the peace she had so desperately sought."
Short for Middle English quietus est (he is quit), a formula of discharge from a debt or other obligation, from Medieval Latin quietus est, from Latin, quietus, past participle of quiescere (to rest), from quies (rest, quiet).
quotidian \kwoh-TID-ee-uhn\ (adjective) –
1 : Occurring or returning daily; as, a quotidian fever.
2 : Of an everyday character; ordinary; commonplace.
"Aline’s sense of fun was typically crushed under the dull, quotidian beats of her routine suburban life."
Quotidian is from Latin quotidianus, from quotidie, "daily," from quotus, "how many, as many, so many" + dies, "day."