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foolish, silly, brainless, empty-headed, giddy
A dingbat is someone who acts like a silly empty-headed person.
Synonyms would be idiot, stupid, or empty-headed.
It is the same thing: You are in irons when you are making no headway.
Childish, empty-headed, barmy, giddy, unprofound, whimsical, volatile, aimless