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.
Your answer would be "Enough"
They are not happy about engaging in trade with humans, due to how things went with Mr. Jones.
