Too few or too little; insufficient in quantity or number.
支給額が過少で生活が苦しい。
The amount paid is too small, so life is difficult.
サンプル数が過少だと統計的に信頼できない。
If the sample size is too small, it is not statistically reliable.
申し込み人数が過少のため、講座は中止になった。
Because the number of applicants was insufficient, the course was canceled.