conscience/'kɔnʃəns/

1.noun [c] 
(sense of morality) 是非感

2.noun [u] 
(belief) 良心

to have a guilty/clear conscience
感到内疚/问心无愧
to have sth on one's conscience
因某事而感到内疚
in all {or} good conscience
 [frm] 凭良心
֧ɨ