adverb
Abbreviation of 散々 (sanzan). Used adverbially to describe something done to an extreme or harsh degree, often with a negative connotation.
See also: 散々
試験に落ちて、さんざな気分だ。
I failed the exam and feel terrible.
彼は上司にさんざ怒られた。
He was severely scolded by his boss.