Many times when someone tells us something we just accept it. We don't consider the question "whether it is true". Perhaps because we trust the speaker. In such cases:
We believe others _____ .
Our acceptance of what other tell us is ______ .
unreflectively/unreflective? non-reflectively/non-reflective? non-speculatively/non-speculative? Immediately/immediately.
"uncritically" sounds to me too strong for such cases.
"Implicitly" first comes to mind:
implicit (adj): 3. With no qualification or question; absolute, "an implicit faith in God"
"Implicitly" suggests that the belief is not subject to the usual criticism or doubt, regardless of any contrary argument or evidence.
Many GOP voters seem to implicitly believe that Donald Trump is good for the party and good for the nation.
Other possibilities: completely, unquestioningly, unreservedly, invariably, unshakably, etc.
