Webster's English Dictionary

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smug

smug \'sm*g\ aj or smug.ger;  or smug.gest [prob. modif. of LG smuck neat, 
   fr. MLG, fr. smucken to dress; akin] to OE smoc smock 1: trim or smart in 
   dress : SPRUCE  2: scrupulously clean, neat, or correct : TIDY  3: highly 
   self-satisfied : COMPLACENT  - smug.ly av