Real Dictionary

slow
adjective: Something that is slow moves, happens, or is done without much speed.

slow in American English
not quick or clever in understanding; dull; obtuse
adjective: moving or proceeding with little or less than usual speed or velocity
adverb: in a slow manner; slowly
intransitive verb: to become slow or slower; slacken in speed
transitive verb: to make slow or slower

slow in British English
adjective: performed or occurring during a comparatively long interval of time
adverb: in a manner characterized by lack of speed; slowly
verb: to decrease or cause to decrease in speed, efficiency, etc

slow-
combining form: slow- is used to form words which describe something that happens slowly.