doubting /ˈdaʊtɪŋ/adjective 1noun 1forms 3phrases 1 adjective1 •Full of doubt; dubious.Had Keir been told two years ago that he would be involved in all these domesticities, he would have been more doubting than a doubting Thomas. — 1932 noun1 •A condition of doubt.A believer may be sometimes so overwhelmed with doubtings, that he may not be able to perceive an assurance in himself. — 1811 formsdoubtings · more doubting · most doubting Phrases with doubting doubting ThomasOne who requires proof before believing.