sincerely

without any attempt to impress by deception or exaggeration thanked them sincerely for their help Synonyms artlessly, guilelessly, ingenuously, innocently, naively (or naïvely), naturally, unaffectedly, unfeignedly, unpretentiouslyRelated Words genuinely, honestly, simply, truly; freely, openheartedly, openly; candidly, frankly, matter-of-factly; casually, coolly (also cooly), nonchalantly; informally, relaxedly, unceremoniouslyNear Antonyms artfully, cannily, deceitfully, deceptively, deviously, dishonestly, falsely; archly, calculatingly, craftily, cunningly, furtively, insidiously, sharply, shiftily, slickly, slyly (also slily), underhand, underhanded, underhandedly; flatteringly, sycophantically, unctuouslyAntonyms affectedly, artificially, hypocritically, insincerely, pretentiously, unnaturally