expression, i-adjective
can't help worrying; extremely worried
Expresses an uncontrollable, intense feeling of worry. The pattern 〜でならない is a fixed expression meaning 'can't help feeling...'.
試験の結果が心配でならない。
I can't help worrying about the exam results.
彼の健康状態が心配でならない。
I'm extremely worried about his health.