Dictionaries of the Scots Language
Dictionars o the Scots Leid

A Dictionary of the Older Scottish Tongue (up to 1700)

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First published 1951 (DOST Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.

Effectuous, -uus, a. Also: -uos, -uous(s)e. [ME. effectuos (c 1400), -uous, OF. efffectueux, med, L. effectuōsus.] Effectual, effective; earnest, urgent. c1420 Wynt. v. 1237.
Haly watyr swa fyrst made he Wytht effectuus [C. -uousse] orysownys Agayne all yl temptatyownys c1460 Wisd. Sol.
Few wordis and effectuous is best fore hym 1533 Boece ix. xv. 326.
To induce gude maneris … na thing was les effectuos than his wordis 1533 Bell. Livy I. 30/18.
Quhilkis wourdis ar richt profittable & effectuus to move the ingine of women to pleser 1581 Burne Disput. a viij b.
God vil send thame ane effectuous, and strang delusioun of error 1592 Acts III. 562/2.
His Maiestie ordanis his effectuus lettrez to be writtin