The Oxford Thesaurus An A-Z Dictionary of Synonyms - staunch adj.

1) steadfast, loyal, firm, unflinching, steady, unshrinking, unswerving, dependable, reliable, (tried and) true, devoted, true-blue, trusty, trusted, faithful, unfaltering, undeviating, unwavering: Charles has always been a staunch supporter of the party. 2) strong, solid, sturdy, sound, well-built, stout, substantial, well-constructed, well-made, tough, rugged, long-lasting; watertight, seaworthy: The ship's staunch oaken hull has withstood much abuse over the years.