Hard

жесток

žestok

(of drink: strong)

напорен

naporen

(demanding a lot of effort to endure)

тврд

tvrd

(resistant to pressure)

тврд

tvrd

(of water, high in dissolved calcium compounds)

тежок

težok

(requiring a lot of effort to do or understand)

тежок

težok

(demanding a lot of effort to endure)

тежок

težok

(severe)

цврст

cvrst

(resistant to pressure)