Question

the old man lifted his eyes slowly ( use the adjective from of 'slowly')

Answer 1

the old man lifted his eyes in a way slow.


Hope it helps✌✌✌✌✌

Answer 2

The old man lifted his eyes in a slow motion.

The adjective form of the word slowly is slow, which can qualify a noun.

Here in the converted sentenced the adjective slow is qualifying the noun motion.

The sentence structure, use of tense, and subject etc. are all kept unchanged in the new sentence.

The minimum conge is done in order to use the slow in the sentence.