How to say "psycho, crazy person (informal)" in Russian?

[Psikh]

"psycho, crazy person (informal)" is Псих in Russian.

Псих means "psycho, crazy person (informal)" in English.

Word #3483 of 6,000 by frequency in Russian.

Сосед снова кричал ночью, настоящий псих.

The neighbor was shouting again at night, a real psycho.

• Возвращать, to return, to give back
• Сорт, sort, variety, grade
• Производитель, manufacturer, producer
• Напарник, partner, workmate
• Пользователь, User
• Нелегко, not easy, hard
• Четверо, four (people)
• Ветвь, Branch