undevised

Without prior arrangement

Undevised means not planned, contrived, or invented—arising naturally or spontaneously rather than through deliberate design: an undevised solution that emerged from the discussion.

In legal contexts, undevised property is real estate not disposed of by will, passing instead through intestate succession.

spontaneous

impromptu

Without advance preparation

offhand · unrehearsed · spur-of-the-moment · on-the-spot · instinctive · impulsive · uncontrived · natural · unpremeditated · winging

unplanned

unintended

Not done on purpose

unconceived · unplotted · uncharted · inadvertent · accidental · fortuitous · serendipitous · unlooked-for · chance · random

unprepared

unready

Not yet prepared

blindsided · surprised · unwarned · unalerted · unbriefed · uninformed · unsuspecting · unaware · unpracticed · unrehearsed

original

uninvented

Not yet devised

undesigned · unengineered · unfabricated · unconstructed · unbuilt · undeveloped · unestablished · nascent · inchoate · embryonic

Opposites
planning and premeditation

undeviseddevised

Planned or invented

planned · premeditated · deliberate · calculated · contrived

artificiality versus naturalness

undevisedcontrived

Deliberately manufactured, unnatural

artificial · fabricated · manufactured · constructed · invented

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Used worldwide · Timeless · Abstract · Rated G