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Webster 1828 Edition

adv.

Indecently. [The latter is the word used.]

undecently ‎(comparative more undecently, superlative most undecently)

(obsolete) Unsuitably; improperly.
- 1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, II.11:
  Philosophie hath done me the pleasure to judge, that so honorable an action, had been undecently [transl. indecemment] placed in any other life, than in Catoes […].
(obsolete) Scandalously; indecently.