One who requires proof before believing. / One who finds belief difficult.

The doubting of one's own abilities.

certainly; doubtlessly; unquestionably; indisputably; doubtless; surely; no doubt

Alternative form of without a doubt

(philosophy) The philosophical idea proposed by Descartes that the world outside the self is subject to uncertainty.

(law) A degree of uncertainty to which a reason can be assigned; in those jurisdictions influenced by English common law, the minimum degree of uncertainty required to acquit a defendant.

plural of doubting Thomas

(idiomatic) Eventuality.

(nonstandard) plural of room for doubt

plural of doubting Thomasina