Webster's English Dictionary

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complacent

com.pla.cent \k*m-'pla-s-*nt\ aj [L complacent-, complacens, prp. of 
   complace-re to please]greatly, fr. com- + place-re to please - more at 
   PLEASE 1: SATISFIED; esp : SELF-SATISFIED  2: feeling or showing 
   complaisance  - com.pla.cent.ly av