Doubt (verb)

  1. To lack confidence in.
  2. To call into question the truth of. To be uncertain or in doubt about.
  3. To consider unlikely.

Doubt (noun)

  1. A lack of confidence
  2. An inclination not to believe or accept.
  3. Uncertainty of belief or opinion that often interferes with decision-making.
  4. A deliberate suspension of judgment.
  5. A state of affairs giving rise to uncertainty, hesitation, or suspense.

The emotion of Doubt is found in the Stomach meridian in the Earth element.

Definition from Dictionary by Merriam-Webster.