Noun
morale - The overall confidence, spirit, or mood of a person or group, especially during challenging times, with a level of enthusiasm and dedication.
Because everyone blamed her for whatever went wrong in the department, this led to her having low employee morale.
tremor - A slight shaking movement, such as one caused by an earthquake or instability; also a subtle or faint sign of emotion, such as fear or excitement in the voice or body.
Because he was nervous, his voice had a significant tremor during the presentation.