"guiltier" in the adjective sense
1. guilty
responsible for or chargeable with a reprehensible act
"guilty of murder"
"the guilty person"
"secret guilty deeds"
2. guilty, hangdog, shamefaced, shamed
showing a sense of guilt
"a guilty look"
"the hangdog and shamefaced air of the retreating enemy"- Eric Linklater
Source: WordNet® (An amazing lexical database of English)
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