Apollinarism or Apollinarianism was a view proposed by Apollinaris of Laodicea that Jesus had a human body but a divine mind.
It was declared to be a heresy in 381 by the First Council of Constantinople, since Christ was officially depicted as fully human and fully God. Followers of Apollinarianism were accused of attempting to create a tertium quid.
Apollinarianism was a heresy of the fourth century bearing the name of its originator, Apollinaris (or Apollinarius) the Younger.
Apollinarianism was the harbinger of the great Christological battles which pitted Antioch against Alexandria, with Rome as referee, and finally issued in Christendom's permanent monophysite schism after the Council of Chalcedon in 451.
The general principle on which Apollinarianism was condemned was the Eastern perception that "that which is not assumed is not healed." If the Logos did not assume the rational soul of the man Jesus, then the death of Christ could not heal or redeem the rational souls of men.
Answer: Docetism, Apollinarianism, Ebionism, and Eutychiaism (also known as monophysitism) are all false views of the relationship between Jesus' deity and humanity.
Apollinarians taught that Jesus' human spirit was replaced by a divine spirit - that Jesus had a human body and soul, but not a human spirit.
Similarly to Docetism, Apollinarianism is refuted by the many Scriptures which teach that Jesus was truly a human being (John 1:14; 1 John 4:1-3).