adverb

• 1With a stare; with eyes wide open; in such a manner as to stare.

• 2Specifically. With reference to perturbation or mental disturbance: wildly, frantically. Now somewhat rare.

  Frequently modifying an adjective denoting a mental state. In later use frequently preceded by stark.

• 3So evidently or obviously as to ‘stare one in the face’; glaringly; palpably.