Worthy of disapproval or blame; deserving to be criticized rather than praised.
From dis- (prefix meaning 'opposite of') + commendable (from Latin commendare, 'to entrust or praise'). The word evolved in English to mean the opposite of praiseworthy, combining the reversing prefix with an existing positive quality.
This word is the linguistic equivalent of a thumbs-down emoji—it's so rarely used that when someone does use it, they're making a deliberate, formal statement of disapproval. It's basically the fancy way to say 'not cool' in academic writing.
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