Hello everyone.
Could you give me a hint how to identify whether it’s necessary to use the indefinite article with uncountable nouns when they have an adjective with them? Should I always use the indefinite article with an uncountable noun if it has an adjective?

Why are the uncountable nouns “trouble” and “immorality” have the indefinite article in the following sentences?

I am in a big trouble and I need your suggestion and advice.

Fr. Wipfler stated his view that impunity is not only the absence of justice, it is also a sin and a terrible immorality.

Question

Hello everyone.
Could you give me a hint how to identify whether it’s necessary to use the indefinite article with uncountable nouns when they have an adjective with them? Should I always use the indefinite article with an uncountable noun if it has an adjective?

Why are the uncountable nouns “trouble” and “immorality” have the indefinite article in the following sentences?

I am in a big trouble and I need your suggestion and advice.

Fr. Wipfler stated his view that impunity is not only the absence of justice, it is also a sin and a terrible immorality.

Answer

indefinite article = a/an
are never used with
uncountable nouns
singular (money, news, advice)
or plural (trousers, scissors)

either "the" or nothing

Answer

"a big trouble" is incorrect. 
OK: "I am in trouble" "I am in big trouble" (slang) "I'm in a lot of trouble"
Sorry I have never seen immortality with a adjective. I feel that is some rhetoric (artistic writing).

Answer

I don't think it has anything to do with the presence of adjective. If you left out the word "terrible," the proper phrasing would still be "a sin and an immorality."

(The indefinite article changes from "a" to "an" for euphony, when preceding a word that begins with a vowel sound).

You could avoid the indefinite article by changing "sin" and "immorality" to their adjectival forms, though: "it is also sinful and immoral."