"Cette proposition n'est pas très inquiétante."
Translation:This suggestion is not very worrisome.
I came here to say the exact opposite! Google ngrams suggests "worrying" is about 30 times as common.
https://books.google.com/ngrams/graph?content=not+worrying%2Cnot+worrisome&year_start=1800&year_end=2008&corpus=0&smoothing=3&share=&direct_url=t1%3B%2Cnot worrying%3B%2Cc0%3B.t1%3B%2Cnot worrisome%3B%2Cc0