1. weak; lacking strength; frail
E.g.: 弱体 (weak body), 軟弱 (weak, soft)
2. to weaken; to grow weak; to enfeeble
E.g.: 衰弱 (weakness, debility, emaciation)
3. a little under; slightly less than
E.g.: 百人弱 (a little under a hundred people)
4. young; youthful; inexperienced
E.g.: 弱年 (youth, young age), 弱輩 (young person, novice)
5. twenty years old
E.g.: 弱冠 (the age of twenty)