manner, adverb of

Any adverb or adverbial phrase or clause that answers the question ‘How?’ after the verb, adjective, or other adverb it qualifies.

‘They worked hard.’ ‘She fought with courage.’ ‘He ran as hard as he could.’ Hard, with courage, and as he could are adverbs of manner – a single adverb, a phrase, and a clause. They qualify the verbs worked, fought, and ran respectively.

‘We played really well.’ ‘He was hopelessly inexperienced.’ Really and hopelessly are adverbs of manner. They tell us how ‘well’ and how ‘inexperienced’. They qualify the adverb well and the adjective inexperienced.