I am stinging. You are stinging. He/she/it is stinging. We are stinging. They are stinging. (Of course, normally only the 3rd person, it or they, would be used with sting.)
Scorpions are arachnids with stinging tails.
You squeeze some liquid out of the stinging nettle and just rub it on to where it stings
It is a neutral connotation.
Negative connotation
a stinging weed is called a nettle
A stinging nettle is a weed.
The stinging cells in a jellyfish are located in it's tentacles.
It is a negative connotation.
uneasy is negative connotation
A general connotation for infinity is forever, but because connotation is dependent on the individual reader, the connotation varies.
Connotation, it combines an adjective with a positive connotation with a verb that has negative connotation.