Unheeded (adjective)

Not paid attention to, not listened to.

Origin:

From the word "un" meaning "not" and "heeded" meaning "paid attention to, listened to".

Examples:

1. His warning went unheeded and the company went bankrupt.
2. Her advice was unheeded and the project failed.
3. The unheeded cries for help echoed through the empty streets.
4. The unheeded pleas for mercy fell on deaf ears.
5. The unheeded signals of danger led to a tragic accident.