As adjectives the difference between slow and ugly
is that
slow is taking a long time to move or go a short distance, or to perform an action; not quick in motion; proceeding at a low speed while
ugly is displeasing to the eye; not aesthetically pleasing.
As nouns the difference between slow and ugly
is that
slow is someone who is slow; a sluggard while
ugly is (slang|uncountable) ugliness.
As a verb slow
is to make (something) run, move, etc less quickly; to reduce the speed of.
As an adverb slow
is slowly.