card-carrying
/ˈkɑːdˌkærɪɪŋ/adjective
attrib.
1- registered as a member of a political party or trade union（党员, 工会会员）登记在册的; 有成员证的。
1.1
- often humorous confirmed in or dedicated to a specified pursuit or outlook〈常幽默〉忠诚的, 坚定的：
a card-carrying pessimist.
一个彻头彻尾的悲观主义者。