急に => quickly; immediately; hastily; suddenly; abruptly; unexpectedly ~ N4
に関わらず/に関わりなく => in spite of; regardless of ~ N2
に関して => about; regarding; related to ~ N3
[関「かん」]して => About A, With relation to A N3
Considering, Concerning
に関わって => to relate to; to have to do with; relating to ~ N2