stale

1 ENTRIES FOUND:
stale /ˈsteɪl/ adjective
staler; stalest
stale
/ˈsteɪl/
adjective
staler; stalest
Britannica Dictionary definition of STALE
[more stale; most stale]
1 
a  of food : no longer good or appealing : no longer fresh
b  : not clean, clear, or pure : having an unpleasant taste or smell
2 
: not interesting or new : boring or unoriginal
3 
: not as strong, effective, or energetic as before