The word "un-attainabilities" describes something that is impossible or difficult to achieve. Antonyms for this word would, therefore, describe things that are achievable or easy to attain. Some antonyms for un-attainabilities could include attainabilities, possibilities, opportunities, or potentials. Other possible antonyms for this word might include accessibility, feasibility, likelihood, or potentiality. In general, antonyms for "un-attainabilities" would describe things that are within reach, feasible, or likely to happen, rather than those that are difficult or impossible to achieve. These opposites offer a more optimistic outlook and suggest that anything is possible if one sets their mind to it.