Wholeheartedly means with complete and undivided commitment. Agree wholeheartedly, wholeheartedly recommend, support it wholeheartedly.
It belongs to agreement and endorsement above all, and its job is to remove any suspicion of reservation. Said of an effort rather than an opinion, it means nothing was held back.
1adverbwholeheartedlyWith complete and undivided commitment.
“I wholeheartedly support your decision to go back to university.”
wholeheartedly is a manner.
From wholehearted plus -ly, from whole plus heart.
From wholehearted + -ly.
Etymology from Wiktionary, CC BY-SA