dour UK /ˈdʊə/US /ˈdʊɹ/ adjective3 •Stern, harsh and forbidding.The principal reason is that, in competition with modern road vehicles running over motorways, B.R. has a dour struggle to match the performance of its rivals cost-wise. — 1961 •Expressing gloom or melancholy. •Unyielding and obstinate. formsdours · dourer · more dour · dourest · most dour