hard-and-fast
(also hard and fast) adjectiveDefinition
› definite and not to be changed, avoided, or ignored: hard-and-fast deadlines/plans/guidelineshard-and-fast evidence/facts/answers With whale research, hard and fast facts are difficult to come by. There are no hard-and-fast rules governing the size of companies in the portfolio.
(Definition of hard-and-fast adjective from the Cambridge Business English Dictionary
© Cambridge University Press)
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