dissemble

verbs

make believe with the intent to deceive
"He feigned that he was ill"; "He shammed a headache"
affect, dissemble, feign, pretend, sham
is derived from
dissembler
is derived from
dissembling
hide under a false appearance
"He masked his disappointment"
cloak, dissemble, mask
behave unnaturally or affectedly
"She's just acting"
act, dissemble, pretend