I can't report it, but the solution has a typo : undutifu, instead of undutiful. (Not here, but in the exercise itself)
Also I would like it if disloyal could be added as meaning.
I came here to say the same thing. Their reporting function really needs an "other" option.
FYI: We are already aware of the typo in "undutiful" and have fixed it on our side, but it sometimes takes a few days before the changes are reflected on the user side in lessons. Apologies for the inconvenience until the updates are reflected for users!
I used the hover hints are wrong option to report the spelling mistake on the tile, since there was no suitable option.
I also agree with Uluare that 'disloyal' would be a good addition.
Thank you Contributors :o)
See previous reply from ehartz yesterday - they are aware and have taken steps but it may take a few days for the changes to take effect.
Undutiful isn't a word in common usage. It needs to accept disrespectful to be practical. To be clear: I'm typing it. Basically, any word it says is acceptable needs to be acceptable.