Utter is a verb and an adjective. It means something is without qualification from the explanation of the internet. Can I use this word as utter love, which is as the substitution for infinite love?
2 Answers
utter love
My utter love for you.
may not be what you want to use, though it is understandable.
One of the properties of a BIG love is duration over time, so usually
undying love
infinite love
everlasting love
get used when proclaiming love to express being boundless by time.
If a person is described as
He is utterly in love with that girl.
he is completely in love with that girl
it usually means they are blind, all consumed, and may not listen to reason especially if someone is trying to warn them. "Utter" does not express the timeless dimension only the "focused" dimension.
You would be understood if you used utter about love but, as this NGram shows, we tend to use the word utter in its adjectival sense about things that have quite strong negative connotations. Examples are contempt, disregard and poverty.