What it means
AといわずBといわず links two nouns to say that the situation applies to both A and B, without making a distinction between them. It often presents two representative extremes or categories and implies that everything in between is included as well. The pattern is common in formal or written descriptions and is used to emphasize breadth or universality.
Usage note
AといわずBといわず normally connects nouns or noun-like expressions, rather than ordinary verb or adjective forms. Do not confuse it with the literal phrase と言わず, which can mean “without saying” in other contexts.
How to use it
NounといわずNounといわず
昼といわず夜といわず、彼は研究を続けました。
He continued his research not just during the day but at night as well.
NounといわずNounといわず
昼といわず夜といわず、彼は研究を続けた。
He continued his research not just during the day but at night as well.