Question

Is unmake sensible a word if not than what is the opposite or the antonym of make sense

Answer 1

Unmake is indeed a word. It is a verb meaning to reverse, or undo the making of. Synonyms include to ruin or destroy.

The use of these words, unmake and sensible, together is uncommon. A better phrase to use would be: "to confuse," "to ignore," or to "be unreasonable, 'depending on the usage.