The antonyms for "more realizable" can be understood by breaking down the meaning of the term. Realizable means achievable, attainable or possible, while "more" signifies an additional degree of possibility. Therefore, the antonyms for "more realizable" would be those that express impossibility, unattainability, or infeasibility.
Some antonyms for "more realizable" may include words like unachievable, unreachable, impractical, unrealistic or improbable. These words connote a sense of difficulty or impossibility of achieving something beyond the standard level of possibility.
In conclusion, antonyms of "more realizable" are words that represent impossibility and unattainability. A clear understanding of these concepts is essential in determining the extent to which something is achievable or not.