irritant

1. N-COUNT If you describe something as an irritant, you mean that it keeps annoying you. 讓人惱火的事[正式]

He said the issue was not a major irritant. 他說這一問題不是讓他惱火的主要原因。

2. N-COUNT An irritant is a substance that causes a part of your body to itch or become sore. 刺激物[正式]

Many pesticides are irritants. 許多殺蟲劑都有刺激性。