reasoned; grounded; with reasons given (АД Alexander Demidov); driven (например: vested-interests-driven, экономически мотивированный Maria Semyonova); substantiated (Entry may only be refused by a substantiated decision stating the precise reasons for the refusal. The decision shall be taken by an authority empowered by ... Alexander Demidov); well-founded (board to enable Parliament to reach a well-founded decision in principle on the means of restoring and renewing the Palace of Westminster. Alexander Demidov); substantive (1. important, real, or meaningful: substantive issues/matters These changes are more symbolic than substantive. No substantive changes were made to the document. 2. supported by facts or logic: substantive arguments There is no substantive reason to change the law. MWALD Alexander Demidov); justified (Gruzovik); borne out (Игорь Миг)
informative (OK, this is a stretch but it feels right - обращаться в Общество с письменными запросами о его деятельности и получать мотивированные ответы - make written inquiries to the Company regarding its operations and to receive informative answers - here I understand the Russian should really be содержательные tfennell); substantiated (gennier); valid
