Japanese pronunciation lookup
いっそう
Said in one Japanese podcast line.
いっそうはげしくどなるようであった。
It seemed like he was getting increasingly angry and shouting.

朗読⭐︎言葉のいろ⭐︎【朗読】山本周五郎「秋の駕籠」
The shows belong to their publishers, and each line plays from the publisher’s own file. Translations are machine-made. Japanese books and courses on Amazon (affiliate link).