The term "more longish" implies an object that is not quite long, but not short either. In terms of antonyms, words like "short," "brief," and "little" might be suitable. However, to convey the opposite of "more longish" truly, one could explore options like "super long," "extended," or "elongated." Other antonyms could be "abbreviated," "minuscule," and "tiny." It is important to note that the choice of antonym depends on how the word "more longish" is used in the sentence/context. By using antonyms, we can describe an equivalent range of characteristics to create a crisp and clear picture of the subject.