1.You don't seem very __________________ about the party tonight. Don't you want to go?
.You don't seem very enthusiastic about the party tonight. Don't you want to go?
2.He left school at 16, not because he was __________________ , but because he wanted to start his working life.
He left school at 16, not because he was unambitious, but because he wanted to start his working life.
3.Don't say this to her, she is really __________________ . She will get upset.
Don't say this to her, she is really sensitive. She will get upset.