1.Definition: incapable of being used with or connected to other devices or components without modification

2.Definition: not compatible

"Incompatible personalities", "Incompatible colors"

3.Definition: not compatible with other facts

Related Adjective(s):discrepant

4.Definition: not easy to combine harmoniously

Related Adjective(s):mismated, unsuited

5.Definition: not in keeping with what is correct or proper

Related Adjective(s):inappropriate, unfitting

6.Definition: not suitable to your tastes or needs

Related Adjective(s):uncongenial

7.Definition: of words so related that one contrasts with the other

Related Adjective(s):contrastive

8.Definition: used especially of drugs or muscles that counteract or neutralize each other's effect

Related Adjective(s):antagonistic

9.Definition: used especially of solids or solutions; incapable of blending into a stable homogeneous mixture