Inclined or given to tedious and excessive moralizing; didactic.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "preachy" in a sentence
"As far as preachy is concerned, man so was Kung Fu Panda, people just liked the kung fu."
"What elevates "Victim" above the preachy is the director's sustained upending of cinematic convention and the film's wealth of strong performances in roles large and small—starting with affecting portrayals by Bogarde and Sylvia Syms, as his patient but conflicted wife."
"I sort of messed it up, because I didn't want to sound too camp and preachy, which is my problem in most of my prose and even poetry."