This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Not adaptive; unable to adapt.

adj. (of a trait or condition) failing to serve an adjustive purpose

"A lot of his recent work has been on nonadaptive processes and genomic architecture, and it has led him down some interesting paths."

maladaptive