stale

US /steɪl/
UK /steɪl/
"stale" picture
1.

no longer fresh and pleasant to eat; hard, dry, or moldy.

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The bread went stale after a few days.
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Don't eat those stale cookies.
:
dryhardoldmouldyspoiled
2.

no longer new and interesting; dull or unoriginal.

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His jokes are getting a bit stale.
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The debate felt stale and uninspired.
:
dullunoriginalhackneyedtriteuninspired
1.

to make or become stale.

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Leaving the cake uncovered will stale it quickly.
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The long, repetitive work began to stale his enthusiasm.
:
spoildeterioratedecaygo offwither