歯が立たない

はがたたない

unable to compete with; not able to make a dent in (e.g. a problem); not able to get a solid hit in (e.g. in a fight)

expression i-adjective

Example sentences

この問題（もんだい）は難（むずか）しくて私（わたし）には歯（は）がたたない。

This problem is beyond my powers.