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Webster 1913 Edition

adv.

In an impertinent manner.

“Not to betray myself impertinently.”

B. Jonson.

adv.

Without relation to the matter in hand.

Officiously; intrusively; rudely.

impertinently ‎(comparative more impertinently, superlative most impertinently)

in an impertinent manner

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