Webster's English Dictionary

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impassive

im.pas.sive \(')im-'pas-iv\ \.im-.pas-'iv-*t-e-\ aj archaic  1a: 
   unsusceptible to pain  1b: unsusceptible to physical feeling : INSENSIBLE  
   1c: unsusceptible to or destitute of emotion : APATHETIC  2: giving no sign 
   of feeling or emotion : EXPRESSIONLESS  3: not moving in any way : 
   MOTIONLESS STOLID mean unresponsive to something that might normally excite 
   interest or emotion. IMPASSIVE stresses the absence of any external sign of 
   emotion in action or facial expression; STOIC implies an apparent 
   indifference to pleasure or esp. to pain often as a matter of principle or 
   self-discipline; PHLEGMATIC implies a temperament or constitution hard to 
   arouse; APATHETIC may imply a puzzling or deplorable indifference or 
   inertness; STOLID implies an habitual absence of interest, responsiveness, 
   or curiosity concerning anything outside of an accustomed routine - 
   im.pas.sive.ly av SYN syn IMPASSIVE, STOIC, PHLEGMATIC, APATHETIC,