Webster’s Revised Unabridged Dictionary · 1913
Instructive
In·struct′ive (ĭn·strŭk′tĭv), a. [Cf. F. instructif.] Conveying knowledge; serving to instruct or inform; as, experience furnishes very instructive lessons. Addison.
In various talk the instructive hours they past. Pope.
— In·struct′ive·ly, adv. — In·struct′ive·ness, n.
The pregnant instructiveness of the Scripture. Boyle.