hardened
/ˈhɑːdənd/adjective
1
- having become or been made hard or harder硬化的：
hardened steel.
淬火钢。
1.1
- strengthened or made secure against attack, especially by nuclear weapons（尤指为防核武器攻击而）加固的：
the silos are hardened against air attack.
发射井被加固以防空袭。
2
- attrib. very experienced in a particular job or activity and therefore not easily upset by its more unpleasant aspects经验丰富的; 老练的：
hardened police officers
老练的警官
in combination a battle-hardened veteran.久经战火考验的老兵。
2.1
- utterly fixed in a habit or way of life seen as bad积重难返的; 顽固不化的：
hardened criminals
顽固不化的罪犯
a hardened liar.
积习难改的说谎者。