conscience-stricken 
adjective
Made uneasy by a guilty conscience: she was still conscience-stricken over her outburst...
- Now the rest of us may have been a cross-section of the conscience-struck, community-minded and well-mannered, but our decisions to remain on the ground were not made out of consultation or a group vote, but individually.
- These are poets as moral actors voicing concerns and dilemmas; they are conscience-stricken purchasers, harassed homemakers, debonair lovers, anxious motorists and old grumps.
- As you might expect, his words do not approach cliche, describing the pain in the conscience-stricken priest's feet, for example, as ‘his daily stigmata’.
Synonyms
guilt-ridden, troubled, disturbed, remorseful, ashamed, shamefaced, apologetic, sorry;
chastened, contrite, guilty, full of regret, regretful, rueful, repentant, penitent, self-reproachful, abashed, sheepish
rare compunctious