1
a
: not easily bent : rigid
a stiff collar
b
: lacking in suppleness or flexibility
stiff muscles
a stiff neck
c
: impeded in movement
—used of a mechanism
a truck's stiff suspension
d
2
3
: hard fought
stiff competition
4
5
: of a dense or glutinous consistency : thick
7
: not easily heeled over by an external force (such as the wind)
a stiff ship
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Merriam-Webster unabridged



