xanthine (group of alkaloids, including caffeine)

Yekaterinburg (a city, the administrative center of Sverdlovsk Oblast, Russia)

being volatile (evaporating or vaporizing readily under normal conditions), volatility

An establishment featuring music and dance as well as food and drink, a night club / (now especially) An establishment in which hostesses serve drinks to and talk with clients in exchange for payment

academic (scholarly; literary or classical, in distinction from scientific)

manicure / applying nail polish / nail polish

unscientific

adventurous (full of hazard)

aggressive

aggressive, offensive