IPA: /ˈskɪtɪʃnəs/
KK: /ˈskɪtɪʃnəs/
The quality of being easily frightened or nervous; a tendency to be jumpy or anxious.
Her skittishness made it difficult for her to relax in crowded places.
Skittishness is formed from "skittish" (from Middle English *skitish*, meaning easily frightened or excitable) and the suffix "-ness" (meaning the state or quality of). The word describes the state of being easily frightened or excitable.
Think of someone who is easily frightened or excitable — that's what 'skittishness' means, the quality of being skittish.