1. delivered a sermon or religious discourse
Usage: past tense of sermonize
2. spoke in a preachy or moralizing manner
Usage: often disapproving

Examples

• The minister sermonized about forgiveness during Sunday service.
• He sermonized to his children about the importance of hard work.
• She sermonized on environmental responsibility at the town meeting.
• The professor sermonized rather than taught, making students uncomfortable.
• My grandfather sermonized about respect for elders whenever we visited.
• The politician sermonized about family values during his campaign speech.