Synonyms for Reedy:

adj.

all (adjective)
wheezy.
grassy (adjective)
green, verdant, lush.
rangy (adjective)
thin.
shrill (adjective)
penetrating, scraping, shrill, raucous, screeching, harsh, squeaky, high-pitched, shrieking, jangling, whistling, treble, squealing, Caterwauling, grating, rasping, cutting, scratching, creaky, jarring, acute, ear-piercing, piercing, whining, strident, hoarse, screaming.
slender/slim (adjective)
lean.

n.

jumpy, clear, metallic, high, plaintive. green, grassy, scrubby, lush, coniferous, woody, wooded, forested, leafy, verdant. piping (noun)
sharp.

Other synonyms:

grassy, plaintive. jumpy. metallic. high. clear. Other relevant words:
leafy, lean, thin, plaintive, coniferous, sharp, grassy, wooded, reedlike, metallic, scrubby, jumpy, wheezy, verdant, woody, lush, green, forested, clear, high.