1. answerable or accountable, as for something within one's power, control, or management (often followed by to or for): He is responsible to the president for his decisions.
2. involving accountability or responsibility, as in having the power to control or manage: promoted to a responsible position in the firm.
3. chargeable with being the author, cause, or occasion of something (usually followed by for): Termites were responsible for the damage.
4. having a capacity for
"risks can be unresponsible."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.