amusive comes from amuse + -ive. Amuse derives from Middle French amuser ('to divert, cause to muse, deceive'), from a- ('at, to') + muser ('to stare stupidly, muse'), of uncertain origin. Morphologically, the word is transparent: -ive is attached to the older base named in the history, so the modern form packages an inherited or borrowed stem inside a later English derivative. In modern use, the adjective sense is "tending to amuse or, archaically, to deceive or delude", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as amuse, amusement, amusing and derivatives such as amusively, amusiveness, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Middle French amuser, Old French muser, which anchor the explanation in named linguistic material.