With childlike credulity (4-4)

I believe the answer is:

dewy-eyed

(Other definitions for dewy-eyed that I've seen before include "Sentimental or innocently trusting, being ocularly moist?" , "Innocent" , "Looking tearful" , "Affected by nostalgic or sentimental tears?" , "Sentimental with moist optics" .)

I've seen this clue in The Guardian.

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