desperate; frantic; excited; worked up; heated; eager
彼は証拠を隠すのに躍起になっている。
He is desperately trying to hide the evidence.
躍起になって取り組んだ結果、問題が解決した。
As a result of working on it frantically, the problem was solved.
親が子どもの受験に躍起になると子どもがつらくなる。
When parents get frantic about their child's exams, it becomes tough for the child.