shameless
UK: ˈʃeɪmləs | US: ˈʃeɪmləs
adj. lacking shame; bold or brazen in behavior
adj. showing no remorse or embarrassment for improper actions
The word "shameless" combines "shame," derived from Old English scamu (meaning disgrace or modesty), with the suffix "-less," from Old English -lēas (meaning without). The fusion creates a term describing someone who acts without regard for moral or social disapproval. The logic is straightforward: removing ("-less") the constraint of shame ("shame") results in unapologetic behavior.
His shameless self-promotion annoyed everyone at the meeting.
She gave a shameless excuse for arriving late.
The politician’s shameless lies were exposed by the media.
It was shameless of him to take credit for her work.
They displayed shameless greed during the charity event.