However, "maintainably" is not commonly used in everyday language. Instead, other adverbs like "steadily," "consistently," or "reliably" are often used to convey the sense of maintaining something.
Here are some examples:
* Instead of: "The system can be maintainably operated."
* You would say: "The system can be operated steadily."
* Instead of: "The car was maintainably built."
* You would say: "The car was built reliably."