苛性 is read as かせい (kasei) and means caustic.
かせい
kasei
かせいかり
caustic potash
かせいそーだ
caustic soda
かせいあるかり
caustic alkali
いじめ
bullying
いらいら
to get irritated
いじめる
to be tough on (e.g. one's body)
tyranny
いらだち
irritation
いらだつ
to be irritated
いらだてる
to irritate
いらだたしげ
antsy
いじめっこ
bully