Explanation
Used to criticize or question unbecoming behavior by someone of a certain status.
Formation
Noun + ともあろう + Noun
Detailed explanation
Noun + ともあろう + Noun is used to express that someone with a certain role or status has done something unbefitting their position. It often carries disapproval or surprise: 'For someone who is supposed to be X, how could they...?'
Examples
Sensei tomoarou mono ga, sonna machigai o suru nante.
For a teacher, it's shocking to make such a mistake.
Otona tomoarou mono ga kodomo mitai ni furumatte wa ikenai.
It's not right for an adult to behave like a child.
Shachou tomoarou hito ga sonna shitsurei na koto o iu nante.
It's shocking that someone who is the company president would say such a rude thing.
Puro no senshu tomoarou mono ga, shiai ni chikoku suru nante.
For a professional athlete, being late to a match is unthinkable.
Practice
Grammar content sourced from hanabira.org.