sincerely

Synonyms

artlessly, guilelessly, ingenuously, innocently, naively (or naïvely), naturally, unaffectedly, unfeignedly, unpretentiously;

Antonyms

affectedly, artificially, hypocritically, insincerely, pretentiously, unnaturally;

Near Antonyms

artfully, cannily, deceitfully, deceptively, deviously, dishonestly, falsely;

archly, calculatingly, craftily, cunningly, furtively, insidiously, sharply, slickly, slyly (also slily), underhand, underhanded, underhandedly;

flatteringly, unctuously;

Related Words

genuinely, honestly, simply, truly;

freely, openheartedly, openly;

candidly, frankly, matter-of-factly;

casually, coolly (also cooly), nonchalantly;