hard-boiled
US /ˌhɑːrdˈbɔɪld/
UK /ˌhɑːrdˈbɔɪld/

1.
cooked in its shell in boiling water until the yolk and white are solid
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She made a salad with sliced hard-boiled eggs.
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I prefer my eggs hard-boiled for breakfast.
2.
tough, unsentimental, and realistic
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He's a hard-boiled detective who doesn't show much emotion.
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The novel features a hard-boiled protagonist navigating a corrupt city.