But it displeased Jonah exceedingly, and he was angry.
(2) It may very well be that Jonah was also aware of the prophetic implications of Nineveh's conversion, forecasting the ultimate rejection of Israel as God's people, and the coming of the Gentiles into that sphere of God's favor, which until then was the sole prerogative of Israel.  A true prophet of God (which Jonah surely was) could not have failed to read the dire implications for Israel in the astounding events he had just witnessed.