The adverb form of the adjective momentous is momentously.
e.g. It was a momentously important event.
Ronald Weasley thinks I'm momentous and appaling.
People consider the day of Martin Luther King Jr's assassination a very momentous day in history.
noun
The base word of "momentous" is "moment."
It will be a momentous day when students stop plagiarizing sentences.
Adverb
The word "momentous" comes from the Latin word "momentum," which means "movement" or "importance." "Momentous" is used to describe something of great significance or importance.
"Use" can function as both a noun and a verb, but it is not an adjective or an adverb. When describing how something is utilized, you might use the adverb "used" in phrases like "used frequently." However, "use" itself does not serve as an adjective or adverb.
The word "momentous" has three syllables: mo-men-tous.
Yes, thankfully we can use it as an adverb. It is the adverb form of the adjective thankful.
You would have to use one of the adverb forms "thoughtfully" or "thoughtlessly."
(You would have to use the adverb, which is tenderly.) She touched his face tenderly.