The antonyms for the word "most insuppressible" are words which indicate being contained, suppressed or subdued. These words include contained, restrained, curbed, subdued, and controlled. If something is contained, it is restricted or limited. If something is restrained, it is held back or restricted. The word curbed means controlled or limited to a certain extent. If something or someone is subdued, they are suppressed or lessened. Finally, if something is controlled, it is managed or directed in a specific way. Using antonyms to "most insuppressible," one can convey the opposite meaning and create balance or contrast in expression.