Unsolvable means that something cannot be solved. This might be because the problem is too big or because there is no solution that is satisfactory to both sides.
The problem is unsolvable because there is too much money involved.
The problem is unsolvable because nobody knows how to do it.
adjective
not easily solved
Synonyms:
1
It is the nature of unsolved problems that the work upon them is tentative.
2
Some say God is ineffable, and thus the problem becomes unsolvable.
3
The crimes remain unsolved.
4
The crime is unsolved and the killer is unidentified.
5
The episode ends with the crime unsolved.
6
The circumstances and the reasons for the attack remain unsolved.
7
The details of the murder case remain unsolved.
8
The killers escaped and the case remains unsolved.
9
The main unsolved part is the motion planning.
10
Both the murder and the motive remain officially unsolved.