The Collaborative International Dictionary
noncombinative
noncombinative \noncombinative\ adj. not combinative. Opposite of combinative. [Narrower terms: noncombining]
Wiktionary
noncombinative
a. 1 Not pertaining to, resulting from, or involving combination. 2 Unable to combine; not combinative.
WordNet
noncombinative
adj. not involving combination [ant: combinative]