Fetching details from the dictionary...

nonsensical; unreasonable; absurd; unrealistic
awfully; extremely; to excess; senseless; reckless
disorder; confusion; being jumbled; being mixed up
very; extremely; excessively
部屋が無茶苦茶に散らかっている。
The room is in complete disarray.
彼の説明は無茶苦茶で理解できない。
His explanation is nonsensical and incomprehensible.
強い台風の直撃を受けて庭の花壇が無茶苦茶になった。
The garden was completely wrecked by the typhoon.