what does res firma mitescere nescit mean and what would a good response be thankyou.?

Answer 1

It depends on the context, but it goes something like this:
The firm object is unable to ripen. (or)
The lasting matter is unable to be allayed.

Res firma is the subject, nescit with the infinitive means unable to ____, mitescere is the infinitive. I have given you the dictionary meanings, as I have no idea of the context in which it was meant. As for a response, I am at a loss.

res rei f. [a thing, object, matter, affair, circumstance]
firmus -a -um [firm, strong, stout; lasting, valid; morally strong]

nescio -ire -ivi and -ii -itum [not to know, be ignorant; to fail to recognize]; *****with infin. [to be unable to do]*****

mitesco -ere [to become mild, soft, or ripe; to be allayed, to subside]