Having no obvious cause; fortuitous or inexplicable.
Groundless or unreasonable.
[H]e […] by his overcarefulneſſe and cauſeleſſe ſuſpicion, deprived himſelf of this benefit, and implunged himſelf in much juſt hatred for his unjuſt dealing and treachery.
From Middle English causelees, causeles; equivalent to cause + -less.
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