IPA: /ʌnˈkwɛsʧənɪŋli/
KK: /ʌnˈkwɛsʧənɪŋli/
In a manner that shows no doubt or questioning; completely accepting something without hesitation or inquiry.
She accepted the decision unquestioningly, trusting her leader's judgment.
Unquestioningly → It is formed from "un-" (meaning not) and "question" (from Latin "quaestio", meaning inquiry or questioning) and "-ingly" (a suffix forming adverbs). The word means to act in a manner that does not involve questioning or doubt.
Think of 'not' ('un-') questioning something ('question') — that's why unquestioningly means to accept something without doubt.