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Webster 1913 Edition

adv.

In an impersonal manner.

adv.

In the manner of an impersonal verb.

impersonally ‎(comparative more impersonally, superlative most impersonally)

in an impersonal manner

impersonally in The Century Dictionary, The Century Co., New York, 1911
impersonally in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913