Diffidence and Compunction

noun

• Lack of self-confidence.
  • synonyms: self-doubt, self-distrust

• (n.) Distrust of one's self or one's own powers; lack of self-reliance; modesty; modest reserve; bashfulness.
• (n.) The state of being diffident; distrust; want of confidence; doubt of the power, ability or disposition of others.

noun

• A feeling of deep regret (usually for some misdeed. ).
  • synonyms: remorse, self-reproach

• (n.) A picking of heart; poignant grief proceeding from a sense of guilt or consciousness of causing pain; the sting of conscience.
• (n.) A pricking; stimulation.