"Serious consequences" refers to negative or significant outcomes that happen as a result of certain actions or events. It means there will be important and potentially harmful effects or results. Full definition
With potentially serious consequences of tickets, there are numerous benefits of hiring a traffic ticket attorney. (dmv.org)
Character means staying true to yourself and your values, even when you're faced with serious consequences for the right choices that you're making — like, perhaps, losing a job. (inc.com)
These measures will also include progressively more serious consequences for repeated or more serious inappropriate behaviour. (slaw.ca)