Distrust of, or lack of confidence in, oneself or in one's own powers.

(theology) Pertaining to aeviternity, a state between eternity, which is unchanging and outside of time, and temporality, which is subject to change and to death or annihilation. Things aeviternal ...

One whose attitude is positive, optimistic, confidently affirmative. / (derogatory) One who habitually agrees uncritically.

(firearms) A device in certain firearms that uncocks the weapon.