The character of being vegetative, in any sense.(noun)
The Century Dictionary (Public Domain)
Use "vegetativeness" in a sentence
"Your favorite exterminator and mine, House Majority Leader Tom DeLay, "apologized" yesterday for threatening federal judges because they refused to prolong Terri Schiavo's persistent vegetativeness."
"Yesterday I reached a state of vegetativeness not seen since high school days."
"It’s subtly mandarin, and you can still taste the green tea’s vegetativeness through it."