shamefaced

Adjective

• showing a sense of guilt
  • a guilty look
    
  • the hangdog and shamefaced air of the retreating enemy- Eric Linklater
    

• showing a sense of shame

• extremely modest or shy
  • cheerfully bearing reproaches but shamefaced at praise- H.O.Taylor
    

Related words

• Synonyms: 
  guilty , hangdog , shamed , sheepish