from the GNU version of the Collaborative International Dictionary of English
- adj. Discordant; inharmonious; incongruous.
from The Century Dictionary and Cyclopedia
- Figuratively, discordant; opposed; contrary: as, “absonous to our reason,” Glanville, Scep. Sci., iv.
From Latin absonus, from ab- ("away") + sonus ("sound"). (Wiktionary)