Careless adjective - Not paying or showing close attention especially for the purpose of avoiding trouble.
Usage example: a careless mistake that caused the plane to crash
Rash is a synonym for careless in thoughtless topic. In some cases you can use "Rash" instead an adjective "Careless", when it comes to topics like arrogant, improvident.
Both words in one sentence
- Under this mask I'm just this rash, careless, clumsy girl... I'm probably not the Ladybug you expected.
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Google Ngram Viewer shows how "careless" and "rash" have occurred on timeline