Source : Webster's Revised Unabridged Dictionary (1913)

-- {Sen"si*tive*ly}, adv. -- {Sen"si*tive*ness}, n.

Source : WordNet®

sensitiveness
     n 1: sensitivity to emotional feelings (of self and others) [syn:
           {sensitivity}]
     2: (physiology) responsiveness to external stimuli;
        "sensitivity to pain" [syn: {sensitivity}, {sensibility}]
     3: the ability to respond to affective changes in your
        interpersonal environment [syn: {sensitivity}] [ant: {insensitivity},
         {insensitivity}]