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If you're referring to older, unsophisticated stories, where the author was being quite straightforward, then "clichéd" is probably what you want. (Plain old unsophisticated works too, or broad or ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/19778 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/19778 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If you're referring to older, unsophisticated stories, where the author was being quite straightforward, then "clichéd" is probably what you want. (Plain old _unsophisticated_ works too, or _broad_ or _simplistic._) If you're referring to current stories, or your own, where you're aware of such stereotypes and you're parodying them, you might say you're being "ironic." That only works if you actually _are_ being ironic and you're mocking the stereotypes by overplaying them rather than writing as though it's correct.