1. most inclined to give moral advice in a tedious or self-righteous way
Usage: superlative form of preachy

Examples

• Of all the characters in the novel, the minister was the preachiest.
• Her preachiest moments came when discussing healthy eating habits.
• The preachiest member of the group always had something to say about everyone’s choices.
• His preachiest speech of the evening focused on the importance of hard work.
• She became her preachiest self whenever the topic of social media arose.
• The preachiest tone in his voice made everyone uncomfortable at dinner.