Amoebous is a word that pertains to the amoeba called amoeboid. It means that something is shapeless or constantly changing form. Synonyms for amoebous include shapeless, formless, and ever-changing. Other synonyms are mutable, fluid, and adaptable. Additionally, gelatinous, protean, and amoebic are also synonyms for amoebous. Words like mercurial, unpredictable, and ambiguous are also similar to amoebous in meaning. Overall, the word amoebous refers to something that is not fixed, but rather, fluid and adaptable much like the ever-changing form of the amoeba.