願望・感情N1
〜てやまない
sincerely... / never cease to... / from the bottom of one's heart
Structure
V-て形 + やまない
Explanation
V-te + やまない: sincerely and ceaselessly (wish, expect, etc.).
Examples
皆様のご健勝を心よりお祈りしてやみません。
I sincerely pray for everyone's good health.
彼の今後の活躍を期待してやまない。
I have every expectation for his future success.
Note
Attached to wish verbs like 祈る/期待する/望む; used in letters and speeches.