[syn: unassailable, unshakable, watertight, bulletproof]
The Collaborative International Dictionary of English v.0.48:
Unshakable \Un*shak"a*ble\, a.
Not capable of being shaken; firm; fixed. --Shak. J. S. Mill.
[1913 Webster]
WordNet (r) 3.0 (2006):
unshakable
adj 1: marked by firm determination or resolution; not shakable;
"firm convictions"; "a firm mouth"; "steadfast resolve";
"a man of unbendable perseverence"; "unwavering loyalty"
[syn: firm, steadfast, steady, stiff,
unbendable, unfaltering, unshakable, unwavering]
2: without flaws or loopholes; "an ironclad contract"; "a
watertight alibi"; "a bulletproof argument" [syn:
unassailable, unshakable, watertight, bulletproof]