Adjective used to describe a theory that doesn't really make sense.

In chess, "unsound" refers to a move or opening that has been decisively proven to lead to a losing position with correct moves by the opponent.

In practice, unsound moves will only work against an unprepared opponent who is not well-versed in chess theory.

Un*sound" (?), a.

Not sound; not whole; not solid; defective; infirm; diseased.

-- Un*sound"ly, adv. -- Un*sound"ness, n.

 

© Webster 1913.

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