It's ridiculous (that) he couldn't solve the problem.
彼がその問題を解けなかったなんて,ばかな
It's ridiculous for a comedian to be without a sense of humor.
喜劇役者にユーモアの感覚がないとはあきれかえる
It's safe to say she's doing a great job.
彼女はよくやっていると言ってよい
It's simple - nothing fancy.
シンプルでまったくごてごてしていない
It's so hard for her to lose weight.
体重を落とすのは彼女にはとても難しい
It's so [unbearably, stiflingly] hot in here.
ここはとても[耐えられないほど,むっとして]暑い
It's still a long way from completion.
それはまだ完成には程遠い
It's strange that ....
…なのは不思議だ
It's such a performance cleaning it.
その掃除はとても大変だ
It's surprising.
それは驚いた