free from affectation; sincere; genuine

The man showed unaffected grief at the death of his former opponent.

unpretentious, as a personality or literary style.

adjective

refined , sophisticated , unnatural , affected , changed , moved

adjective

artless , candid , direct , folksy * , forthright , frank , genuine , guileless , homey * , ingenuous , modest , naive , natural , plain , simple , sincere , single , spontaneous , straightforward , true , unartificial , unassuming , unpretentious , unschooled , unspoilt , unstudied , up front , aloof , callous , calm , casual , cold fish * , cool , easy-going , hard-boiled * , hard-hearted , impassive , impervious , laid-back * , not influenced , proof , steady , thick-skinned * , unaltered , unconcerned , unexcited , unimpressed , uninfluenced , unresponsive , unruffled , unstirred , untouched , cold-blooded , emotionless , unemotional , unmoved , innocent , unsophisticated , unworldly , heartfelt , hearty , honest , real , unfeigned , unmannered