to worry about; to be worried about; to fret about; to not know what to do; to be at a loss (as to what to do)
彼はずっと進路に思い悩んだ。
He agonized for a long time over his career path.
一人で思い悩むのは良くない。
Worrying all alone isn't good.
新米の母親は仕事と育児の両立を思い悩んでいる。
The new mother is agonizing over balancing work and childcare.