auxiliary N1 rare writtenliterary
〜てやまない — to ~ unceasingly
〜てやまない ・ てやまない
Builds on て形
A full written guide for 〜てやまない is on the way.
This point is mapped in the grammar tree, but its examples, formation table and usage notes haven't been written yet. The fastest way to learn it now is to meet it in real sentences inside Jengo.
See 〜てやまない in real sentences
Jengo shows 〜てやまない the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.