How it used to be written
These are the forms of 頑, the traditional character: 顽 is a twentieth-century simplification, found in no ancient corpus.
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Small seal script -
Clerical script 東漢
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).
Examples
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尽管受到暴君的迫害,英雄还顽强地斗争。
In spite of the tyrant’s persecution, the hero valiantly carried on the struggle.
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烤箱内如有液体洒出,应立即清理,以免留下顽固污渍。
Clean up spills inside the oven as soon as they happen to avoid stubborn stains.