Moralistic describes someone who judges others too harshly about right and wrong, or who constantly lectures people about how they should behave. A moralistic person doesn't just have strong values: they feel compelled to tell everyone else what to do and criticize those who don't measure up to their standards.

Imagine a classmate who's always pointing out when others break minor rules, not because it helps anyone but because they enjoy feeling superior. Or picture someone who turns every conversation into a sermon about proper behavior. That's being moralistic: treating every situation as a chance to judge or instruct others rather than simply living by your own principles.

The word has a negative tone. Having morals (your sense of right and wrong) can be important, but being moralistic means you've crossed into being preachy, self-righteous, or judgmental. A moralistic book doesn't just tell an interesting story with a meaningful lesson: it lectures the reader constantly about how to behave. A moralistic speech doesn't simply try to inspire people to be better: it scolds them for their mistakes.

The difference between being principled and being moralistic is the difference between living your values yourself and insisting everyone else live by your rules.