If you get the same Donkey Kong score every time you play, you're consistent. It's consistent with video-game addiction, however, that you will continue to play in the hopes of beating that score.
Consistent is related to the word consist, which refers to what something is made of—"bread dough consists of flour, water, and salt." Consistency describes texture—a consistent consistency would be brownies as rock-hard in the center as they are at the edge––hopefully, next time you bake you'll get inconsistent results.
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