1. adverb /ˈhɑːdli,ˈhɑɹdli/
a) Harshly, severely.
Let him hardly be possest with an honest curiositie to search out the nature and causes of all things [...].
I cant really deal hardly with people.
2. interjection /ˈhɑːdli,ˈhɑɹdli/
Not really.
I think the Beatles are a really overrated band. &x2015; Hardly!
Wikipedia foundation.