Synonym of STUPID

Answer: Option A

Silly : having or showing a lack of common sense or judgement; absurd and foolish.
Disobedient : refusing to obey rules or someone in authority.
Insane : in a state of mind which prevents normal perception, behaviour, or social interaction; seriously mentally ill.
Incapable : unable to do or achieve (something).
Stupid : having or showing a great lack of intelligence or common sense.

Synonym of Stupid is Silly