Anxiousness is the state of being anxious - nervous, worried, or
concerned for something or someone.
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Anxiousness can increase overall blood pressure. Calming down
helps :} If your diatolic is over 90, you need to consider
controlling it. Over 100 and you need to stop considering and just
do it. Much higher than that calls for hospitalization.
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(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."