Bashful or modest (10)
I believe the answer is:
shamefaced
I believe this is a double definition.
'bashful' is the first definition.
(thesaurus)
'modest' is the second definition.
(thesaurus)
(Other definitions for shamefaced that I've seen before include "Sorry-looking" , "Very modest, bashful" , "Hangdog" , "Displaying dishonour" , "Looking guilty" .)