staler; stalest
1
: tasteless or unpalatable from age
stale bread
2
: tedious from familiarity
a stale routine
3
: impaired in legal force or effect by reason of being allowed to rest without timely use, action, or demand
a stale affidavit
a stale debt
4
: impaired in vigor or effectiveness
staleness
noun
staled; staling
: to become stale
: urine of a domestic animal (such as a horse)
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Merriam-Webster unabridged
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