Reedy means thin and high in tone. A reedy voice, a reedy note, reedy and thin.
It describes a sound with little body behind it, and the comparison is with a reed instrument — an oboe or a clarinet played thinly. Of a place it means full of reeds. Note reed, the plant and the vibrating strip in a woodwind instrument, which are the same word.
1adjectivereedyThin and high in tone.
“The choirboy's reedy voice wavered on the high notes.”
2adjectivefullFull of reeds.
“Ducks nested along the reedy edges of the lake.”
reedy is a quality of sound.
Reed plus -y, from Old English hreod, the plant. The instrument's reed is the same word.
Middle English
reedy
English, today
reedy
From Middle English reedy, reedi, reeddy, equivalent to reed + -y.
Etymology from Wiktionary, CC BY-SA