expression
without saying; not
Used in negative constructions to mean 'without saying' or 'not'. Often appears in phrases like 何と言わず (without saying anything).
彼は何と言わずに部屋を出て行った。
He left the room without saying anything.
expression
whether ... or ...; be it ... or ...; ... as well as ...
Used in the pattern AといわずBといわず to mean 'both A and B' or 'whether it's A or B'. Emphasizes that the statement applies to all mentioned items.
手といわず足といわず、体中が痛い。
My whole body hurts, whether it's my hands or my feet.
昼といわず夜といわず、彼はいつも働いている。
He's always working, day and night.