The antonyms for the word "more inspissated" would be words like thin, diluted, or watery. Insipid, feeble, or bland could also work as antonyms for the word. The term inspisated refers to something that has become thick, dense, or concentrated over time. When looking for antonyms for this word, it makes sense to seek out phrases that convey the opposite of such qualities. For instance, a synonym for "more inspissated" might be "more viscous," so its antonym would instead be "less viscous" or "runny.