težak

Etymology 1
.

Adjective

 * 1) heavy, weighty
 * 2) difficult (of a job)
 * 3) unpleasant (of air)
 * 4) complex, difficult to understand (of a topic or subject)
 * 1) unpleasant (of air)
 * 2) complex, difficult to understand (of a topic or subject)

Etymology 2
Derived by nominalization from the first etymology, originally denoting a person doing difficult tasks.

Noun

 * 1) farmer, agriculturalist
 * 2) day laborer