(set phrase) A person who is not easily deceived or victimized; one who is perceptive, clever, or thoroughly common-sensical.

Synonym of nobody's fool

plural of fool-saint

(idiomatic) A bad bargain; one that leaves the person accepting it worse off.

(derogatory, slang) One who uses fossil fuels without concern for their environmental impact.

present participle of fool around

A philosophy of life, holding that people who do not look for an easy way of earning a living are foolish.

(economics) Theory that the price of an object is determined by irrational beliefs and expectations of market participants, rather than intrinsic value; i.e. that one can make money by buying something for the sole reason of selling it to some one else for a higher price.

An imaginary personage said to like everything that is good, and plenty of it.

Alternative spelling of April Fools' Day