Alleviable, a word rarely used in everyday language, means capable of being relieved or lessened. While it might not roll off the tongue easily, there are several synonyms that convey the same idea. Replace "alleviable" with "remediable" to indicate something that is able to be resolved or improved. Another term, "mitigable", suggests that the situation or condition can be alleviated or reduced. You can also use "relievable" to express that relief or ease can be attained. Lastly, "reducible" signifies that the problem or burden is capable of being decreased or diminished. These various synonyms provide alternatives to the less common term "alleviable" when seeking to express the concept of relief or lessening.