The word "queachy" is a rather unusual and rare term to come across. It refers to something that is soft and marshy or moist, which can be quite difficult to find the right synonyms for. However, some of the best options include words like boggy, spongy, mucky, swampy, squishy, damp, oozy, and sodden. These words not only describe the texture of the queachy substance but also convey related concepts like wetness, stickiness, and instability. Other possible synonyms include words like quaggy, soggy, and miry, which convey a similar sense of sluggishness and lack of firmness. Ultimately, the choice of synonym will depend on the context in which the word is being used, and the exact qualities of the object or substance that is being described.