Webster's English Dictionary

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incompatible

in.com.pat.i.ble \.in-k*m-'pat-*-b*l\ \-ble-\ aj [MF & ML; MF, fr. ML 
   incompatibilis, fr. L in- + ML compatibilis] compatible 1: incapable of 
   being held by one person at one time  2a: incapable of association because 
   incongruous, discordant, or disagreei ng {~ colors} 2b: unsuitable for use 
   together because of undesirable chemical or physiol ogical effects {~ 
   drugs} 2c: not both true {~ propositions}  2d: not satisfiable by the same 
   set of values for the unknowns {~  equations} 2e: incapable of blending 
   into a stable homogeneous mixture - used of so lids or solutions - 
   incompatible n