improving

adj

1. That tends to improve someone or something (especially (dated) to educate or morally better a person).

   “1663, Robert Boyle, Some Considerations Touching the Usefulnesse of Experimental Naturall Philosophy, Oxford: Ric[hard] Davis, Essay 1, p. 2, […] that Diviner part of Man, the Soule, which alone is capable of wearing the Glorious Image of its Author, being endowed with two chief Faculties, the Understanding and the Will; the former is blest and perfectionated by Knowledg, and the latter’s Loveliest and most improving property is Goodnesse.”

   “[…] nothing is so improving to the Temper as the Study of the Beauties, either of Poetry, Eloquence, Musick, or Painting.”

   “She was so overcome by the splendor of his achievement that she took him into the closet and selected a choice apple and delivered it to him, along with an improving lecture upon the added value and flavor a treat took to itself when it came without sin through virtuous effort.”

   “To boast mendaciously about one’s own gang and to slander and defame other gangs are acts everywhere officially regarded as creditable and even pious. It is as though our rulers, instead of merely tolerating prostitution, were to proclaim the brothel to be a place as sacred as the cathedral and as improving as the public library.”

   ““Nothing to do but keep the chin up and the upper lip as stiff as can be managed. I think I’ll go to bed with an improving book. […]””

verb

1. (form-of, gerund, participle, present)present participle and gerund of improve