Sentence:  The captain, at Mr Allworthy's instance, was outwardly, as we have said, reconciled to his brother; yet the same rancour remained in his heart; and he found so many opportunities of giving him private hints of this, that the house at last grew <WSD>insupportable</WSD> to the poor doctor; and he chose rather to submit to any inconveniences which he might encounter in the world, than longer to bear these cruel and ungrateful insults from a brother for whom he had done so much. 
Meaning of the word marked with <WSD> tags:  That cannot be tolerated or endured.