feel strong—
1. be in good health:
- I had just celebrated my birthday and was feeling strong after a short vacation.
2. be in a strong position:
- Saddam makes war in only two sets of cases: when he feels weak and when he feels strong!
feel strongly—be convinced; firmly believe:
- We all felt strongly that a pilot ought to have a clear, visual reference to his surroundings.
Cf.: feel strongly about something—adopt a stern attitude about smth. which cannot be easily ignored:
- Holding up a sign in public in protest over something you feel strongly about takes a lot of courage.