50 synonyms for understandable such as admissible, clear, acceptable, and accountable. Understandable is an adjective, and its antonyms are incomprehensible and unfathomable.
Clear, coherent, comprehensible, crystal clear, digestible, easy to understand, explicit, fathomable, glanceable, graspable, intelligible, lucid, penetrable, perspicuous, plain, straightforward, transparent, unambiguous, and user-friendly.
Acceptable, accountable, admissible, allowable, conceivable, defensible, excusable, expected, explainable, explicable, foreseeable, forgivable, imaginable, inevitable, justifiable, justified, logical, natural, normal, on the cards, par for the course, pardonable, plausible, predictable, rational, reasonable, tenable, thinkable, to be expected, and unsurprising.