Student or Learner
he is running slowly?
in the above sentence slowly is adverb because it indicates how the action is going
here also slow indicates how we have to go then why we are not using slowly word
'Slow' is sometimes used informally as an adverb, especially after 'go'.
Some other adjectives are also used as adverbs in preference to the -ly adverb, often in a limited range of expressions. Examples include:
Hold tight, Buy direct from the manufacturer, Play fair,