形容詞 persuasive:

1. tending or intended or having the power to induce action or belief
2. capable of convincing

1. Persuasive, powerful discourse.
   雄辯有說服力的，有力的演講
2. They believed the child by his persuasive reasons.
   他們因那個孩子有說服力的理由相信了他。
3. He talked to her with persuasive manner.
   他以曉之以禮的態(tài)度勸說她。
4. Your argument seemed not very persuasive.
   你的論據不太有說服力。

per.sua.sive

adj.（形容詞）
Tending or having the power to persuade:
有說服力的，易使人信服的：
例句：
a persuasive argument.
令人信服的論據

【引伸】
persua.sively
adv.（副詞）
persua.siveness
n.（名詞）