1. I've hardly finished my homework.
2. I've finished my homework hardly.
Which is correct?
The second order would be possible but with a large pause before the adverb; even then, a different choice of adverb would be more likely: 'I've finished my homework... Almost - I still have to do the Bibliography'. And in the mouth of a second speaker, that adverb would make sense:
A: I've finished my homework.
B: Hardly - didn't she ask for a thousand words?