willingly Eagerly
Reluctantly has four syllables.
He agreed very Reluctantly. Do not show me your reluctantly or I will fire you.
No, "reluctantly" is not a preposition. It is an adverb that describes the manner in which an action is being done.
reluctant
willingly; eagerly
For a circumspect opposite, it would be meekly or humbly.To do something without pride would be shamefully, ashamedly, reluctantly, or guiltily.
She reluctantly agreed to go to the party, even though she had other plans.
Reluctantly, she jumped into the cold water.
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reluctantly
adverb
Reluctantly is an adverb.