Made, or having the qualities, of adamant (adamant, n. 1a); unable to be broken or dissolved; unbreakable; impenetrable. Also figurative and in…

Of something abstract: possessing qualities comparable to those of rock, esp. resembling rock in solidity and endurance.

Not malleable; inflexible, unbending, unadaptable.

Transformed into or as if into marble; made hard or rigid. Also: represented in or ornamented with marble.

figurative. Firm, impregnable; rigidly confined or restricted; unyielding, inflexible.

Unalterable, rigidly fixed.

figurative. Hard, insensible to fatigue; rigid, stern, unbending; ‘hard-and-fast’, unyielding, wanting in pliancy or adaptiveness. (Hyphenated.)

attributive and in other combinations, as teak forest, teak log, teak-oil, teak ship, teak timber, teak-tree, teak-wood; teak-built (in quot. 1847…

figurative. Hard, rigid, unimpressionable.

figurative. That does not expand and contract in accordance with circumstance or need; unyielding.

figurative. Hardened, immobilized, paralysed, (now) esp. rigid with fear, terrified (of).

figurative. slang (chiefly U.S.). Drunk, intoxicated.

proof against shattering; also figurative.

figurative. Unmoving, unchanging, rigid.