"Nie mam siły."

Translation: I do not have strength.

[polishmarc]

"I have no strength" should be correct

[thewilq]

Every time you see a mistake report it, don't just comment. It's beta, our reports make better experience for others.

[mootlinger]

Another answer is "I don't have the strength", which Duolingo accepted. For example, "I don't have the strength to go on".

[IanBiddle]

I would really like more notes: I realise this is beta and I'm enjoying it, but a clear briefing about the various case endings when they come up would be helpful.

[dsh1968]

I wonder if "I'm tired" should be acceptable. Poles often say "Nie mam sily" where English speakers would just say they're tired (physically). Like at the end of a hard workout.

[Jellei]

The meaning may be close, but it's still a different sentence.

[JKWolf17]

Says superman

[Walkinthedog]

Would I am weak work

[Trofaste]

It could have pretty much the same meaning (but the Polish sentence more likely means that I just don't have strength right now), but it's a different sentence: Jestem [słaby/słaba].