stultification

C. G. Jungの "Modern Man in Search of a Soul" を読んでいます。第5章 'The Stages of Life' から引用します。

The serious problems of life, however, are never fully solved. If it should for once appear that they are, this is the sign that something has been lost. The meaning and design of a problem seem not to lie in its solution, but in our working at it incessantly. This alone preserves us from stultification and petrifaction.

"stultification and petrifaction" の "petrifaction" は昔米国アリゾナ州にある国立公園の "Petrified Forest"（化石の森）に行った時に覚えた単語ですが、"stultification" あるいはその基になる動詞 "stultify" は知らない単語なので辞書を見ます。

・Oxford English Dictionary: Cause to lose enthusiasm and initiative, especially as a result of a tedious or restrictive routine.: For many of us, such a subdued, small town, near communitarian environment would feel repressive, stultifying.
・Collins Dictionary: If something stultifies you, it makes you feel empty or dull in your mind, because it is so boring.: This attitude stultifies scientific progress.
・Dictionary.com: to become ineffectual or impaired, especially through frustrating, stifling, or deadening conditions: Without novelty the mind can stultify.

日本では余り知られていませんが、"Petrified Forest" 国立公園は大きな木の化石があちらこちらに散在していて一見の価値があり、お勧めです。