Dear friend, you're looking for the antonym.
Shrewd means clever; intelligent.
The opposites of intelligent (in adjectives) are foolish, naive, and stupid.
Naive
There is no opposite it's an adjective.
The opposite of a problem (challenge, difficulty) could be a solution, answer, or fix.The opposite of the adjective problem could be easy, facile, or effortless.
There is no direct opposite of the noun. However, the opposite of the adjective formulaic (ordinary, usual, boring) could be innovative, unique, or unconventional.
Shrewd
no
The opposite of "most shrewd" would be "least shrewd."
yes
ANSWER: stupid ,foolish, dum, naive, not smart
adjective 1 having or showing sharp powers of judgment; astute : she was shrewd enough to guess the motive behind his gesture | a shrewd career move. 2 archaic (esp. of weather) piercingly cold : a shrewd east wind. • (of a blow) severe : a bayonet's shrewd thrust. • mischievous; malicious.
The opposite of the adjective "flattest" is "steepest."
The opposite of the adjective closed is open. The opposite of the verb closed is opened.
opposite is an adjective
The adjective opposite can also be a noun (the opposite) but the other noun form of "to oppose" is opposition.
The adjective is emotional. The opposite is emotionless.
The adjective is emotional. The opposite is emotionless.
There is no opposite it's an adjective.
The opposite of heavy is light.