The word "unachievably" means something that cannot be accomplished or attained. When searching for synonyms for this word, one can consider terms like unattainable, impossible, impracticable or unrealistic. Other synonyms include insurmountable, unfeasible, unreachable, hopeless, out of reach, and unattainable. Another notable synonym that can be employed is non-viable, unworkable, or infeasible. These synonyms serve as alternative words that express the same meaning. If you are wondering how to apply these synonyms in a sentence, you could say, "The goal was unattainable, and the team had to look for alternative solutions".