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Webster 1913 Edition

adv.

At once; absolutely.

[Obs.]

adv.

At once; quite; absolutely. Obs.

sheerly ‎(comparative more sheerly, superlative most sheerly)

Absolutely; thoroughly; utterly; purely; quite
- 1988 October 21, George Grass, “WagnerVision”, in Chicago Reader:
  On a sheerly technical plane, the projections used for the backgrounds were very effective, particularly in the third act, where a sunset faded most convincingly.
(obsolete) at once