Feeling humiliated and frustrated, he could no longer brook the indifferent attitude of the government.

Suffer : experience or be subjected to (something bad or unpleasant).
Support : bear all or part of the weight of; hold up.
Condone : accept (behaviour that is considered morally wrong or offensive).
Tolerate : allow the existence, occurrence, or practice of (something that one dislikes or disagrees with) without interference.
Brook : tolerate or allow (something, typically dissent or opposition).

Synonym of Brook is Tolerate