Watch the news; there is many a journalist who uses precise words and ones that are less trite. In listening to someone like this, you hear the word used in context and learn, not just the denotation, but its connotation and the appropriate occasion for the word's use.
Watch movies, especially ones that are dramas. Turning on the old movie channel may be helpful as people from the 1940s had a better command of English than some of the modern "stars."
Listen to the lyrics of songs; there may be some words in these that you will not know. For, the idea is to hear these words used in real life. Most people who speak well have been around other people who speak well. Granted, they have learned many words from reading, but their "active" vocabulary usually comes from real situations.