English » One Word Substitution

Select the option that can be used as a one-word substitute for the given group of words.

A problem that is so difficult that it cannot be answered

A

Impossible

B

Solvable

C

Insoluble

D

Terrible

Solution

option C insoluble is the correct pick for the given set of words.

other options

impossible- that which can not be done

solvable- that which can be solved.

terrible- very; extremely