the word 'whiney' is a modern english derivative of the older verb 'whine'. the verb itself has ancient onomatopoeic roots in proto-germanic \hwīnaną, imitating a high-pitched, drawn-out sound of complaint or distress, which evolved into old english hwinan. the adjectival suffix '-y', from old english -ig, is a prolific english word-forming element meaning 'full of' or 'characterized by'. thus, the literal construction 'characterized by whining' logically evolved to describe a person or tone that is habitually complaining or fretful, capturing the persistent, grating quality of the original sound.

Structure: whine (to complain in a feeble way) + y (adjective-forming suffix) whine (from old english hwinan, meaning to whiz or hiss, of imitative origin; functional role: core semantic root) + y (from old english -ig, meaning characterized by; functional role: derivational suffix forming adjectives).