inconsistent
in-con-sis-tent
adjective
Not staying the same; varying or contradictory, especially over time or in different parts.
"Her performance has been inconsistent this season."
Thesaurus
Synonyms: discrepant, uneven, scratchy, incompatible, self-contradictory, spotty, conflicting, at odds, contradictory, unconformable, unreconciled, incongruous
Antonyms: consistent