"To nie jest lekkie."

Translation: It is not light.

[ZelvaCZ]

How would you say "it is not easy" in Polish? One would use "lehký" in Czech for both "light" and "easy"...

[immery]

no. while "ciężkie"-heavy can mean difficult/hard, lekkie rarely means easy. Easy is "łatwe". or "proste"- "straight"

[va-diim]

Yes, in Russian it's the same usage as Czech. Eto nie liehko means "It's not easy," although легко liehko is an adverb meaning "easy" as opposed to легкий/легкая/легкое liohkij/liohkaja/liohkoje adjective meaning "light/not heavy".

[Helena834099]

Light means 2 things, not heavy and not dark.

[Jellei]

True. But in Polish 'lekki' only means 'not heavy', although it can be more metaphorical.

'not dark' is 'jasny'. Which can also mean 'clear', like in "Yup, everything's clear".