The term "most sickish" implies an intense feeling of nausea or disgust, but its antonyms can provide some relief. One antonym for "most sickish" is "pleasant," which describes something that brings joy or satisfaction. Another antonym is "delightful," which implies a sense of enjoyment or pleasure. Similarly, "invigorating" suggests a feeling of rejuvenation or stimulation, whereas "refreshing" denotes a sense of revitalization or renewal. Other antonyms for "most sickish" include "appetizing," "enticing," "appealing," and "wholesome," which all evoke positive connotations of health, vitality, and well-being.