Definition of unpartial in US English:
unpartial
adjective
1Unbiased, fair; = "impartial".
2With to. Not partial to or fond of; ill-disposed or antagonistic to.
Origin
Mid 16th century; earliest use found in Thomas Raynalde (fl. 1542–1552), physician and printer. From un- + partial.
Pronunciation
unpartial
/(ˌ)ʌnˈpɑːʃl/