slight vs tenuous

slight is a noun but tenuous is not a noun.

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

As adjectives, slight and tenuous are synonyms defined as:

Other synonyms of slight include flimsy, fragile, thin.

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

slight (adjective)	tenuous (adjective)
(quantifier used with mass nouns) small in quantity or degree; not much or almost none or (with `a') at least some	lacking substance or significance
lacking substance or significance	very thin in gauge or diameter
being of delicate or slender build	having thin consistency

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