As undulate means to rise and fall, become wavy or rippled, an antonym would be to "roughen".
No the word undulating is not a noun. It can be an adjective and a verb.
The fields of wheat were undulating in the breeze.
Undulating is a word used to describe something that has a wavy appearance. A good sentence would be, the girls hair was undulating.
The antonym of the word 'synonym' is 'antonym'.
Undulating
Undulating is a verb and requires an an adverb, not an adjective, which describes a noun: Slowly undulating, sensuously undulating.
now ____________ The word when does not have an antonym. Not every word has an antonym.
The antonym of the word 'out' is 'in'.
The singer's voice undulated
An undulating lowland is a lowland with an uneven or "undulating" surface. There are no outstanding highlands in the area.
An antonym for the word enlarge is reduce. (An antonym is a word that means the opposite of another word.)