Mots difficiles en anglais

(prononcer "kwak")
coin-coin → suddenly he heard a quack.
(doctor) charlatan → I went everywhere for treatment, tried all sorts of quacks.

[concept, idea, word] désuet in 2015 information will only come in video, and text and images will become some quaint, outdated media, like engravings are now. quaint old 50s phrases. the Seventies disco craze now seems impossibly quaint and dated.
pittoresque quaint little shops and arcade restaurants.

sables mouvants. « It's like quicksand, the longer you stay, the deeper you sink. »

bizarrerie. Be aware of quirks like this.
by some quirk of fate = par un caprice du hasard
manie  He was fascinated by people's quirks.