What is it called when someone isn't okay with a situation but learns to just deal with it? Is there even a word for that?
The person learns how to cope with the situation.
cope, from Collins English Dictionary: '
- intransitive verb If you cope with a problem or task, you deal with it successfully.
It was amazing how my mother coped with bringing up three children on less than
thirty dollars a week.
- intransitive verb If you have to cope with an unpleasant situation, you have to accept it or bear it.
Never before has the industry had to cope with war and recession at the same time
Acquiesce - verb
To accept something reluctantly but without protest. https://www.merriam-webster.com/dictionary/acquiesce
It is called contending (with that situation).
1 (contend for) [no object] Struggle to surmount (a difficulty or danger)
‘she had to contend with his uncertain temper’
‘Not only are they contending with the sudden drop in temperatures, one was shot with an arrow and one lost its home.’