the world > action or operation > behaviour > customary or habitual mode of behaviour > unaccustomedness or state of disuse > [adverb] > in an unfamiliar manner
unfamiliarly1895
1895 I. K. Funk et al. Standard Dict. Eng. Lang. II.Unfamiliarly.
1979 C. E. SchorskeFin-de-Siècle Vienna vii. 362 It was a prophetic Lebensgefühl that produced the explosion in the garden: a humanism unfamiliarly mixed with nihilism.