What is the prefix of lacking senses responsibility?

There isn't a single, commonly used prefix that directly means "lacking sense or responsibility."

However, we can use combinations of prefixes and roots to express this idea:

* Irresponsible: This combines the prefix "ir-" (meaning "not") with the root "-responsible," directly conveying the lack of responsibility.

* Insensate: This combines the prefix "in-" (meaning "not") with the root "-sensate" (meaning "having sense or feeling"). This emphasizes the lack of sense or awareness, but can also imply a lack of empathy or compassion.

* Unthinking: This combines the prefix "un-" (meaning "not") with the root "-thinking" (meaning "thoughtful"). This emphasizes the lack of deliberation or consideration, suggesting impulsive behavior.

* Reckless: This word itself doesn't have a clear prefix, but it describes someone who acts without considering the potential consequences.

* Careless: Similar to "reckless," this word signifies a lack of attention to detail or potential harm.

The best prefix to use depends on the specific context and nuance you want to convey.