The adjective 'springy' is a native English formation built upon the ancient Germanic verb 'spring'. This verb's core sense, preserved from Proto-Germanic \springaną, is one of sudden movement, leaping, or bursting forth. The concept of elasticity is a metaphorical extension of this action—an object that 'springs' back to its original position. The suffix '-y', also of Old English origin, is added to nouns to create descriptive adjectives. Thus, 'springy' literally means "having the quality of springing," which evolved into its modern meanings describing both physical resilience and lively, energetic movement.

Structure: spring (to leap, to be elastic) + y (adjective-forming suffix) - spring: From Old English springan (to leap, burst forth, grow), of Germanic origin. In this word, it functions as the core root conveying the sense of elasticity or resilience. - y: A productive English suffix from Old English -ig, used to form adjectives meaning "characterized by; full of; having the quality of".