"I don't firmly understand this".
yes e.g. he held her hand firmly.
Honestly
I lay on the ground and look for shapes in the clouds. You can ground yourself by planting your rubber soles firmly on the ground.
My word is my bond. The glue will bond your two pages together firmly.
he rested his broken leg firmly onto the hassock
The root word "mon" in "admonished" means to warn or scold someone firmly. In this sentence, the hall monitor cautioned or rebuked you for shouting.
Sealing usually means, to be encasing something in an envelope or another object, so a good sentence would be:When sealing an envelope, make sure that it is pressed down firmly.
Yes, it is an adverb. It is the adverb form of the adjective firm, and means in a firm way, or in a determined manner. E.g. The lines were firmly attached to the boat. The governor firmly refused to compromise.
He held her hand firmly.He was firmly set on his opinion.You are firmly in the wrong.
"The spade was dug firmly into the ground"
firmly
use it by saying- how can you use the word ebullient in a sentence?