In the sentence It was quite late for a phone call which word is used as an adverb?

The adverb in the sentence "It was quite late for a phone call" is quite.

Here's why:

* Adverbs modify verbs, adjectives, or other adverbs. They tell us how, when, where, or to what extent something happens.

* Quite modifies the adjective late, telling us to what extent it was late.

Let me know if you'd like to explore more about adverbs!