Synonyms of preachify
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harangueIf someone harangues you, they try to persuade you to accept their opinions or ideas in a forceful way.
• haranguing her furiously in words she didn't understand
speakgo ondiscourselecturepreachspout (informal)haranguedeclaimspiel (informal)descantoratespeechifykorero (New Zealand)
lectureIf you lecture on a particular subject, you give a lecture or a series of lectures about it.
• She has lectured and taught all over the world.
Thesaurus for preachify from the Collins English Thesaurus