1. important, serious, crucial
2. valuable, precious
3. serious matter, major incident, matter of grave concern, crisis
4. great undertaking, great enterprise, great thing
5. safe, OK
1. to raise, to bring to (someone's attention)
2. to appeal to (reason, emotions, etc.), to work on (one's emotions), to play on (one's sympathies)
3. to complain
4. to sue (a person), to take someone to court
5. to resort to (e.g. arms, violence)