The sentence 'Stubborn as a mule' is a simile as it contains the word 'as' which makes it a comparison.
The man was as stubborn as a mule.
Simile
Determination
Determination, and sometimes defiance
A simile.
A metaphor
It is a simile.
As quick as a wink is a simile. ----
simile
simile its a simile when you use "like"
simile It is an example of a simile (uses like or as). A simile in itself though is a type of metaphor.
Curiosity, analytical thinking, skepticism (different from stubborness!)
simile
that man