Choose the word which best expresses the meaning of the given word: Inscrutable.

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Whatever opinion he gives is $sane$.

Choose the word which best expresses the meaning of the given word.
$RESTRAINT$

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The leader nodded his $approbation$.

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Manish $neglected$ to remit the fees in time and therefore had to pay a fine.

Choose the word which best expresses the meaning of the given word. Flex