It is just a waste of time. If you want to explain "a", I suppose you could say that it is not a waste of time that the reader already knows about, so the indefinite article is appropriate.
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Jigneshbharatiwe use "a" before singular countable nounThe use of articles may or may not be logical and consistent in English. An article may even be used before an adjective in some fixed expressions such as all of a sudden. Just learn to use English the way natives use it and wo
Jigneshbharatiwe use "a" before singular countable noun so are "waste" and "time ( I doubt)" countable singular? I want to know how the rule for a/an is applicable here? thanks"time" is uncountable there. "waste" is singular countable. "waste of time" is pretty much a set phrase. "wastes of time" is sometimes used, though not common.