connective N1 rare writtenliterary
〜といわず — not to mention ~
〜といわず ・ といわず
A full written guide for 〜といわず 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 〜といわず in real sentences
Jengo shows 〜といわず 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. Editorial confidence: medium.