The Collaborative International Dictionary of English v.0.48:
hard-and-fast \hard-and-fast\ adj. invariable; firmly established; as, hard-and-fast regulations. Syn: strict. [WordNet 1.5]WordNet (r) 3.0 (2006):
hard-and-fast adj 1: (of rules) stringently enforced; "hard-and-fast rules" [syn: hard-and-fast, strict]