You could use: "lamentably"
It sort of means the same thing.
Look it up.
Reluctantly has four syllables.
He agreed very Reluctantly. Do not show me your reluctantly or I will fire you.
No. The word reluctantly is an adverb. It cannot be a preposition.
reluctant
willingly Eagerly
willingly; eagerly
He reluctantly agreed to go along. She entered the contest reluctantly, certain she would lose.
Reluctantly, she jumped into the cold water.
reluctantly
page 21
adverb
Reluctantly is an adverb.