くしんさんたん
taking great pains
Also written 苦心惨澹
Noun, Suru verb, Intransitive
苦心惨憺くしんさんたんの末すえ、考かんがえ出だした企画きかくが、会議かいぎで一瞬いっしゅんにして却下きゃっかされちゃうんだからな。
After all the trouble we went to in coming up with that project, it only took them a second to shoot it down in the meeting.