1. Not compatible
   "incompatible personalities"; "incompatible colours"
    
2. Incapable of being used with or connected to other devices or components without modification
   "The outdated hardware was incompatible with the latest software"
    
3. Not suitable to your tastes or needs
   "the incompatible roommates were always fighting";
   - uncongenial
    
4. Not in keeping with what is correct or proper
   "completely incompatible behaviour";
   - inappropriate, out of keeping, unfitting
    
5. Not compatible with other facts
   "The incompatible statements from different witnesses confused the jury";
   - discrepant
    
6. Used especially of drugs or muscles that counteract or neutralize each other's effect
   "The incompatible muscle groups worked against each other, reducing overall strength";
   - antagonistic
    
7. Used especially of solids or solutions; incapable of blending into a stable homogeneous mixture
   "The two chemicals were incompatible and formed separate layers"
    
8. (of a couple) not compatible; unsuitably matched
   "The incompatible pair struggled to find common interests";
   - ill-sorted, mismated, unsuited, ill-assorted, ill-suited
    
9. Of words so related that one contrasts with the other
   "'rich' and 'hard-up' are incompatible terms";
   - contrastive

See also: antacid, antagonistic, antiphlogistic, antonymous, clashing, contradictory, different, disagreeable, immiscible, incongruous, inconsistent, inharmonious, mismatched, mutually exclusive, non-miscible, out of line, out of order [Brit], out-of-line, uncongenial, unfriendly, unharmonious, unmixable, unsympathetic

Antonym: compatible, congenial

Encyclopedia: Incompatible