Meaning

• Disbelief or uncertainty (about something); a particular instance of such disbelief or uncertainty.

  "I have doubts about how to convert this code to JavaScript."

• A point of uncertainty; a query.

Meaning

• To be undecided about; to lack confidence in; to disbelieve, to question.

  "He doubted that was really what you meant."

• To harbour suspicion about; suspect.

• To anticipate with dread or fear; to apprehend.

• To fill with fear; to affright.

• To dread, to fear.