名詞 defensive:

1. an attitude of defensiveness (especially in the phrase `on the defensive')
   同義詞：defensive attitude

形容詞 defensive:

1. intended or appropriate for defending against or deterring aggression or attack
2. attempting to justify or defend in speech or writing
   同義詞：justificative, justificatory
3. serving as or appropriate for defending or protecting

1. Our troops took up defensive positions on high ground overlooking the river.
   我部隊(duì)在臨河高地上占據(jù)了防御陣地。
2. When asked to explain her behavior, she gave a very defensive answer.
   當(dāng)問她為什么要這樣做時(shí)，她極力為自己辯護(hù)。
3. She's very defensive about her part in the affair.
   她極力掩蓋她在此事中充當(dāng)?shù)慕巧?/div>

de.fen.sive

adj.（形容詞）
Intended or appropriate for defending; protective.
保護(hù)的，防御的：為保衛(wèi)而設(shè)計(jì)的或適于保衛(wèi)的；保護(hù)的

Intended to withstand or deter aggression or attack:
防御性的，自衛(wèi)的：預(yù)期能耐得住進(jìn)攻的或能阻止進(jìn)攻的：
例句：
a defensive weapons system; defensive behavior.
防御性的武器系統(tǒng)；防衛(wèi)行為

Sports Of or relating to the effort to prevent an opponent from gaining points in a game or an athletic contest.
【體育運(yùn)動(dòng)】 防守的：指在球賽或體育競賽中，努力阻止對方得分的
Of or relating to defense.
關(guān)于保衛(wèi)的
Psychology Constantly protecting oneself from criticism, exposure of one`s shortcomings, or other real or perceived threats to the ego.
【心理學(xué)】 自我保護(hù)的，自衛(wèi)的：不斷地保護(hù)自己，使自我不受批評(píng)，不暴露自己的短處或不受其它真的或可察覺的事威脅自我的
n.（名詞）
A means of defense.
防御工具，防御手段
An attitude or position of defense.
防御的態(tài)度或守勢

<習(xí)慣用語>on the defensive
Prepared to withstand or counter aggression or attack.
處于守勢：隨時(shí)準(zhǔn)備防御或?qū)θ肭趾瓦M(jìn)攻進(jìn)行反擊
【引伸】
defen.sively
adv.（副詞）
defen.siveness
n.（名詞）