uneven

not even or uniform as e.g. in shape or texture; "an uneven color"; "uneven ground"; "uneven margins"; "wood with an uneven grain"

(of a contest or contestants) not fairly matched as opponents; "vaudeville...waged an uneven battle against the church"

not divisible by two

variable and recurring at irregular intervals ; "an uneven gait"; "uneven spacing"

lacking consistency; "the golfer hit the ball well but his putting was spotty"