The compound 'wide-eyed' is a transparent descriptive formation from native English elements. The adjective 'wide', with its ancient Germanic roots conveying breadth and openness, is combined with 'eyed', an adjectival form derived from the Old English word for 'eye'. The literal meaning, 'having eyes opened wide', is a direct physical description. Over time, this vivid physical image became a metaphor for emotional and cognitive states: the eyes opened wide in surprise or awe, and by extension, an attitude of innocent wonder or naive credulity. The logic of the word's evolution is a clear path from a concrete physiological description to an abstract characterization of mental or emotional innocence.

Structure: wide (broad) + eyed (having eyes) - wide: From Old English wīd (spacious, extensive), of Germanic origin. In this compound, it functions as an adjective describing the state of the eyes. - eyed: From Old English ēage (eye) + the suffix -ed, used to form adjectives meaning 'having' or 'provided with'. It functions as the base noun modified by the preceding adjective.