"sensitiveness" in the noun sense
1. sensitivity, sensitiveness
sensitivity to emotional feelings (of self and others)
2. sensitivity, sensitiveness, sensibility
physiology) responsiveness to external stimuli the faculty of sensation
"sensitivity to pain"
3. sensitivity, sensitiveness
the ability to respond to physical stimuli or to register small physical amounts or differences
"a galvanometer of extreme sensitivity"
"the sensitiveness of Mimosa leaves does not depend on a change of growth"
4. sensitivity, sensitiveness
the ability to respond to affective changes in your interpersonal environment
Source: WordNet® (An amazing lexical database of English)
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