Indecorous is a related term of shameless.
As adjectives the difference between indecorous and shameless
is that indecorous is improper, immodest or indecent while shameless is having no shame, no guilt nor remorse over something wrong; immodest; unable to feel disgrace.
shameless
English
Adjective
(
en adjective)
having no shame, no guilt nor remorse over something wrong; immodest; unable to feel disgrace
Derived terms
* shamelessly
* shamelessness