slightly sour or acidic, not strongly so, often describing a mild tanginess
кислый
extremely self-assertive in a way that annoys others
самоуверенный
characterized by high quality, elegance, and extravagance
роскошный
talking a great deal, particularly about trivial things
болтливый
extremely evil or wicked, typically involving illegal or immoral actions
гнусный
honorably retired from assigned duties and retaining your title along with the additional title `emeritus' as in `professor emeritus'
заслуженный профессор в отставке
characterized by excessive ingratiation or flattery, often in a way that seems insincere or manipulative
елейный
(of animals and plants) found and developed only in a particular place and not been brought from elsewhere
коренной
done or happening naturally, without any prior thought or planning
спонтанный