形容词

1. 防御（性）的;防卫（用）的;保护的
You use defensive to describe things that are intended to protect someone or something.

2. （表现在行为上）防御的，戒备的，卫护的
Someone who is defensive is behaving in a way that shows they feel unsure or threatened.

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

Synonym: defensive attitude