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Definition of heartily : 1. From the heart; with all the heart; with sincerity.
2. With zeal; actively; vigorously; willingly; cordially; as, he heartily assisted the prince.

Synonyms:

warmly, seriously, sincerely, earnestly, warm

doggedly, resolutely, intently, boldly, devotedly, persistently, decisively, indefatigably, diligently, loyally, steadily, fearlessly, tenaciously, staunchly, dauntlessly, pluckily, faithfully, relentlessly, courageously, truly, toughly, stubbornly, valiantly, indomitably, deliberately, decidedly, determinedly, tirelessly

thoroughly, completely, wholly, totally

convivially, garrulously, amiably, hospitably, neighborly, genially, congenially, friendly, talkatively, amicably, cordially, graciously, sociably, companionably, gregariously, vivaciously, chattily, affably, courteously

obstinately, stonily, bravely, unflaggingly, stiffly, fervently, enduringly, undauntedly, steadfastly, strongly

vigorously, energetically, zealously

Usage examples:

• She laughed heartily at that, and then the subject dropped. - "The Squire's Daughter", Silas K(itto) Hocking.
• I'm glad to know it," cried Mr. Smith heartily. - "Oh, Money! Money!", Eleanor Hodgman Porter.
• And so saying, the stranger shook the hand of Alfred heartily, and, turning, walked hastily away. - "The Lights and Shadows of Real Life", T.S. Arthur Edition: 10 Language: English.