They were fed-up with his doltish behaviour.

Correct option is B

The correct synonym of the given word is (b) imbecilic.
· Doltish: The word means stupid or foolish; lacking intelligence.
Hindi meaning: मूर्ख
Example: "His doltish comments made everyone roll their eyes."
· Synonym: Imbecilic: meaning stupid; foolish or nonsensical.
Hindi Meaning: मूर्खतापूर्ण
Example: "The imbecilic prank caused trouble for everyone involved."
· Synonyms: foolish, dim-witted, slow, simple-minded.
· Antonyms: intelligent, clever, bright, wise.
Meanings of all options:
· Wise: having or showing experience, knowledge, and good judgment.
· Imbecilic: lacking intelligence or good judgment; foolish.
· Clever: quick to understand, learn, and devise or apply ideas; intelligent.
· Precocious: having developed certain abilities or inclinations at an earlier age than usual.