Translation:You speak slowly.
slow should also work
Slow is an adjective, slowly is an adverb. "Your speech is slow" vs "You speak slowly"
not quite: slow is an adjective and an adverb
slowly only an adverb
My partner who is Romanian has mentioned that this would be more to tell someone that they were speaking softly.
'Te rog, vorbesti mai incet' Please speaking softer ie...calmer if in an argument or somthing?