Definitions from Wiktionary (doubt)

▸ verb:  (ambitransitive) To be undecided about; to lack confidence in; to disbelieve, to question.
▸ verb:  (transitive, archaic outside Scotland) To harbour suspicion about; suspect.
▸ verb:  (transitive, archaic) To anticipate with dread or fear; to apprehend.
▸ verb:  (transitive, obsolete) To fill with fear; to affright.
▸ verb:  (ambitransitive, obsolete) To dread, to fear.
▸ noun:  (uncountable, countable) Disbelief or uncertainty (about something); (countable) a particular instance of such disbelief or uncertainty.
▸ noun:  (countable, obsolete or India) A point of uncertainty, especially a yes/no or a multiple-choice question

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