Use of Time
I'm not even sure you read the definition of the word when you posted it to me.
First, don't think I haven't noticed how you did not take the definition for toughness from my link, but from somewhere else in order to take a few words out of context, to try and give them a meaning they do not have.
Second, trekverse 'humans have the sturdiness/hardyness of cockroaches' is a comparison. A quite adequate one, too. That you have trouble stomaching it is irrelevant.
Third, humans are easily killed by almost everyone of note and his idiot cousin in the trekverse. Not even close to being able to take a lot of damage before succumbing.