dissemble

dissemble (http://definr.com/dissemble)

     v 1: make believe; "He feigned that he was ill"; "He shammed a
          headache" [syn: feign, sham, pretend, affect]
     2: hide under a false appearance [syn: cloak, mask]
     3: behave unnaturally or affectedly; "She's just acting" [syn:
        pretend, act]