Wholeheartedly/ˌhəʊlˈhɑːrtɪdli/ Definition 1 of 1Pro Tip 1/3Emotional Strength Reflects a profound level of commitment or belief that you have. She wholeheartedly threw herself into charity work. Pro Tip 2/3No Hesitation Implies certainty and lack of doubt about the action or belief. He joined the campaign wholeheartedly, without any doubts. Pro Tip 3/3Persuasive Emphasis Can be used to convince others by showing genuine enthusiasm. I wholeheartedly recommend this book; it changed my life.