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The Collaborative International Dictionary
Absonous

Absonous \Ab"so*nous\, a. [L. absonus; ab + sonus sound.] Discordant; inharmonious; incongruous. [Obs.] ``Absonous to our reason.''
--Glanvill.

Wiktionary
absonous

a. (context obsolete English) discordant; inharmonious; incongruous. (Attested from the early 17th century until the mid 18th century.)(R:SOED5: page=9)