He had a great aversion to taking things too hard; he thought that half the discomfort and many of the disappointments of life come from it; and for an instant he asked himself whether, possibly, he did not appear ridiculous to this intelligent young man, whose private perception of incongruities he suspected of being keen.
There are no more uses of "aversion" in the book.
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Our older staff tend to have an aversion to change.
Mankind have a great aversion to intellectual labor; but even supposing knowledge to be easily attainable, more people would be content to be ignorant than would take even a little trouble to acquire it.