дурник

Other ways to say it

• безмозкийbrainless (having no brain); brainless, stupid (unintelligent; having little or no common sense)
• бовдурchimney; a pillar/cloud of smoke
• вайлоclumsy person, klutz, oaf; schmuck
• дуреньfool, idiot, imbecile (person with poor judgement or little intelligence); a simple card game in which the last player holding cards in their hand is the loser (durak)
• дуркоfool, idiot, imbecile (person with poor judgement or little intelligence)
• йолопan idiot, a simpleton, a stupid person.