NAIVELY
naively
(adverb) in a naive manner; “he believed, naively, that she would leave him her money”
Source: WordNet® 3.1
Etymology
Adverb
naively (comparative more naively, superlative most naively)
In a naive manner.
Source: Wiktionary
Na"ïve`ly, adv.
Definition: In a naïve manner.
NAIVE
Na"ïve`, a. Etym: [F. naïf, fem. naïve, fr. L. nativus innate,
natural, native. See Native, and cf. Naïf.]
Definition: Having native or unaffected simplicity; ingenuous; artless;
frank; as, naïve manners; a naïve person; naïve and unsophisticated
remarks.
Source: Webster’s Unabridged Dictionary 1913 Edition