決して~ない => never; by no means ~ N3
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
に即して/に則して => According to/ in keeping with/ to be based on ~ N1
に決まっている => certainly; I’m sure/certain that; it must be the case that ~ N2
に[即「そく」]して => In accordance with A, Keeping A in mind, In keeping with A N1
Based/focused/depending on
に[決「き」]まっている => A is a given, A must be the case N2
Information, Report