fragile vs slight

fragile is not a noun while slight is a noun.

Word	Noun	Adjective	Verb	Adverb
fragile	No	Yes	No	No
slight	Yes	Yes	Yes	No

As adjectives, fragile and slight are synonyms defined as:

Other synonyms of fragile include flimsy, tenuous, thin.

fragile (noun)	slight (noun)
	a deliberate discourteous act (usually as an expression of anger or disapproval)

fragile (adjective)	slight (adjective)
easily broken or damaged or destroyed	(quantifier used with mass nouns) small in quantity or degree; not much or almost none or (with `a') at least some
vulnerably delicate	lacking substance or significance
lacking substance or significance	being of delicate or slender build

fragile (verb)	slight (verb)
	pay no attention to, disrespect