stale is the dictionary form of staler Definition of stale
1
[ adjective ] showing deterioration from age

Examples

"stale bread"

2
[ adjective ] lacking originality or spontaneity; no longer new

Synonyms

old moth-eaten

Examples

"moth-eaten theories about race"

3
[ adjective ] no longer new; uninteresting

Synonyms

cold

Examples

"cold (or stale) news"

4
[ verb ] urinate, of cattle and horses
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