Definition of phantasmally in English:
phantasmally
(also fantasmally)
adverb fanˈtazm(ə)lifanˈtazməli
In a phantasmal manner or form; as a phantasm.
Origin
Mid 19th century; earliest use found in Frances Power Cobbe (1822–1904), writer and campaigner for women's rights. From phantasmal + -ly.