を禁じ得ない|をきんじえない

Expresses that a strong emotion wells up in response to a situation and cannot be suppressed; 'cannot help feeling ~', 'cannot hold back ~'. It follows a noun denoting a feeling such as tears, anger, sympathy, or emotion.

A stiff, formal expression found mainly in writing, speeches, news commentary, and essays. It describes a feeling triggered by a situation, often a tragic or moving scene, and is common in narration about oneself or others. It is far more formal than ずにはいられない, which covers similar ground in everyday speech.

• 1.
  てやまないN3「てやまない」attaches to the て-form of verbs and expresses a long-cherished wish or feeling, often used for blessings, hopes, or reverence; 「を禁じ得ない」attaches to nouns and describes emotions that cannot be suppressed when one is moved by something. The two are generally not interchangeable.
• 2.
  ずにはいられないN3「ずにはいられない」attaches to the ない-form of verbs, is neutral in register, and besides emotional reactions like crying or getting angry can also express being unable to resist doing something. Only in its emotional-reaction sense can it be rephrased with 「を禁じ得ない」, and when converting to 「ずにはいられない」you must switch to the verb form.
• 3.
  てならないN2「てならない」attaches to the て-form of verbs and to adjectives, expressing feelings or sensations so strong they are unbearable, and with words like 「思われる」it describes thoughts arising involuntarily; 「を禁じ得ない」attaches only to nouns and sounds more formal, so the two cannot be directly swapped.
• 4.
  てたまらないN2「てたまらない」attaches to adjectives and the て-form of verbs, is neutral in register, and besides emotions can also express physical sensations such as pain, cold, or heat; 「を禁じ得ない」attaches only to nouns expressing emotions or emotional displays and is formal and literary. The two cannot directly replace each other.
• 5.
  限りだN1「限りだ」attaches to emotion-related adjectives or 「noun + の」and focuses on expressing an intense feeling of 'extremely...'; 「を禁じ得ない」attaches only to nouns and emphasizes being moved to the point of being unable to suppress one's feelings. Both are literary, but their attachments differ, so they cannot directly replace each other.
• 6.
  の極みN1「の極み」emphasizes that an emotion or state has reached its peak, and can also evaluate things as extremely extravagant, irresponsible, and so on; 「を禁じ得ない」emphasizes being so moved that the feeling cannot be suppressed, and is used only for emotions and their outward expression. Both attach to nouns and lean literary, but they are generally not interchangeable.

Unlike ずにはいられない, てならない, and てたまらない, which attach to verbs or adjectives and sound more conversational, を禁じ得ない takes an emotion noun and is formal. てやまない expresses a lasting wish or hope (願ってやまない), while 限りだ and の極み mark the highest degree of a feeling or state rather than an irrepressible emotional reaction.