っぱなし

っぱなし is used to describe that something has been left in a certain state and has remained that way for a period of time. It often implies a sense of neglect or carelessness, and can also express that an action continues unintentionally. It’s commonly attached to the stem form of a verb (the form before る in る-verbs, or the -i/renyou form for godan verbs) or directly to a noun to indicate leaving it as-is. The nuance is less about intention and more about the result of not changing that state.