Definition of shameless adjective from the Oxford Advanced Learner's Dictionary

 

shameless

 adjective
adjective
BrE BrE//ˈʃeɪmləs//
 
; NAmE NAmE//ˈʃeɪmləs//
 
(disapproving)
 
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not feeling ashamed of something you have done, although other people think you should synonym unashamed a shameless display of greed Some claimed he was a shameless womanizer. Word Origin Old English sc(e)amlēas (see shame, -less).
See the Oxford Advanced American Dictionary entry: shameless