introspectiveness n thoughtfulness about your own situation and feelings Usage(s) With newfound introspectiveness, Gasnier confessed and accepted his 10-year sentence at Tihar, even though the prosecution lacked evidence. He is played by Christopher Walken with a charmless introspectiveness that seems perversely calculated to put the audience off. With newfound introspectiveness, Gasnier confessed and accepted his 10-year sentence at Tihar, even though the prosecution lacked evidence.