Source : Webster's Revised Unabridged Dictionary (1913)

Inquietude \In*qui"e*tude\, n. [L. inquietudo: cf. F.
   inquietude.]
   Disturbed state; uneasiness either of body or mind;
   restlessness; disquietude. --Sir H. Wotton.

Source : WordNet®

inquietude
     n : feelings of anxiety that make you tense and irritable [syn:
         {edginess}, {uneasiness}, {disquietude}]