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Webster 1828 Edition

, adv.

In a manner contrary to reason.

Excessively; immoderately; more than enough.

unreasonably ‎(comparative more unreasonably, superlative most unreasonably)

In an unreasonable manner.
He behaved unreasonably.
Of or relating to something that is unreasonable.
The team was given an unreasonably short amount of time to put together a presentation.

in an unreasonable manner

relating to something that is unreasonable