How to pronounce “imbecile” in English

Here are all the things I can fix. "Shortly after this accident, I received notice from the landlord that the property had been sold to the London County Council for the purposeof erecting a very large imbecile asylum. It appears that I had prepared the ground, so all that was necessary was to erect the buildings."He never did build his flying machine. And he turned his attentions elsewhere. But he was so dedicated to bring scientific rigor to this field, that he contributed immeasurably