This is the 1055th most frequent Polish word.
ciężko
"Ciężko" means "heavily" or "hard" in English, depending on context.
The word 'ciężko' here is used as an adverb to mean 'hard' or 'difficult', describing the challenge of waking up.
Ciężko jest wstawać rano, gdy jest zimno.
It's hard to wake up in the morning when it's cold.
In this sentence, 'ciężko' modifies the verb 'pracuje', indicating the manner of working—putting significant effort.
Tomek pracuje ciężko, aby osiągnąć swoje cele.
Tomek works hard to achieve his goals.
'Ciężko' is again an adverb, used to convey difficulty in expressing emotions in this context.