incompatible

(a) not compatible
- incompatible personalities
- incompatible colors
(a) used especially of drugs or muscles that counteract or neutralize each other's effect antagonistic,
(a) not suitable to your tastes or needs
- the uncongenial roommates were always fighting
- the task was uncongenial to one sensitive to rebuffs
uncongenial,
(a) incapable of being used with or connected to other devices or components without modification
(s) of words so related that one contrasts with the other
- "rich" and "hard-up" are contrastive terms
contrastive,
(s) not easy to combine harmoniously ill-sorted, mismated, unsuited,
(s) not compatible with other facts discrepant,
(s) not in keeping with what is correct or proper
- completely inappropriate behavior
out or keeping, unfitting, inappropriate,
(s) used especially of solids or solutions; incapable of blending into a stable homogeneous mixture

antagonistic uncongenial contrastive ill-sorted mismated unsuited discrepant out or keeping unfitting inappropriate

compatible interactive synergistic congenial

incompatibly