incompatible

conflicting inappropriate incongruous inconsistent irreconcilable unsuitable unsuited

uncongenial

adverse antipathetic antipodal antithetical clashing contrary counter disagreeing discordant discrepant disparate factious inadmissible incoherent inconformable inconsonant inconstant jarring marching to a different drummer mismatched night and day offbeat opposed opposite poles apart unadapted warring whale of difference

appropriate consistent fitting harmonious proper suitable

compatible consonant loving suited well-matched