podżegający Englisch:

express loudly a view that turned out to be seditious to the social order

to crush seditious uprisings

inflammatory language about “infidels” and “unbelievers”.

What the mayor is claiming is spurious and inflammatory.

Macierewicz’s incendiary language may concern diplomats in Brussels already wary about the victory of the nationalist and Eurosceptic Law and Justice.

an incendiary bomb/device