IPA: /ˈtrɛm.jə.ləs.nəs/
KK: /ˈtrɛm.jə.ləs.nəs/
The quality or state of shaking or trembling, often due to fear or nervousness.
Her voice had a tremulousness that revealed her anxiety during the speech.
Tremulousness → It is formed from "tremulus" (from Latin, meaning trembling or quivering) and the suffix "-ness" (meaning the state or quality of). The word "tremulousness" refers to the state of being trembling or quivering.
Think of 'trembling' ('tremulus') to remember that 'tremulousness' means the quality of being shaky or quivering.