WordNet (r) 3.0 (2006):

stretchy
    adj 1: capable of being easily stretched and resuming former
           size or shape [syn: stretchable, stretchy]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "stretchy":
   adaptable, adaptive, anesthetized, bouncy, buoyant, cataleptic,
   comatose, doped, dozy, dreamy, drowsy, drugged, drugged with sleep,
   elastic, extensile, flexible, flexile, half asleep, heavy,
   heavy with sleep, heavy-eyed, in a stupor, languid, lethargic,
   lively, napping, narcoleptic, narcose, narcotized, narcous,
   nodding, oscitant, out of it, resilient, responsive, sedated,
   sleep-drowned, sleep-drunk, sleep-filled, sleep-swollen, sleepful,
   sleepy, slumberous, slumbery, snoozy, somnolent, soporific,
   springy, stretch, stretchable, stuporose, stuporous, supple,
   whippy, yawning, yawny