(slower,slowest)(used especially in the comparative and superlative forms, or in compounds)at a slow speedsynonymslowlyCould you go a little slower?slow-drying paintslow-moving traffic(North American English)Drive slow!Which Word?slow / slowlySlowly is the usual adverb from the adjective slow. Slow is sometimes used as an adverb in informal language, on road signs, etc. It can also be used to form compounds:Slow. Major road ahead.a slow-acting drugThey walk very slow. In the comparative both slower and more slowly are used:Can you speak slower/more slowly?
Word OriginOld Englishslāw‘slow-witted, sluggish’, of Germanic origin.Idioms