save, rescue, protect
tough
This is a tough one to answer
Tender meat
The simple ones
I am guessing that you mean tough. Antonym for that depending on your meaning would include: weak, malleable, compliant.
No, spry means agile and lively, almost the opposite of stiff.
A easy question
rough
Cluster means a close grouping of things, so yes it would be considered an antonym. Words it is opposite of would be: one, singular, etc.
Retain
there isnt one so tough