Hard

силен

silen

(of drink: strong)

твърд

tvǎrd

(resistant to pressure)

твърд

tvǎrd

(of water, high in dissolved calcium compounds)

тежък

težǎk

(demanding a lot of effort to endure)

тежък

težǎk

(severe)

труден

truden

(requiring a lot of effort to do or understand)

труден

truden

(demanding a lot of effort to endure)

усилен

usilen

(severe)

трудно

trudno

(with much force or effort (related to act of think))