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Anxiousness is the state of being anxious - nervous, worried, or concerned for something or someone.
(there is already a noun form for anxious, which is "anxiety")
"As the snow continued to fall, his anxiousness about the hikers' safety increased."
"The timid librarian demonstrated anxiousness in any new situation."
The color often associated with anxiousness is green, as it can evoke feelings of nervousness, restlessness, and unease.
It is anxiousness !
frustrating! =)