Meaning

adjective resembling or characteristic of a phantom

originFrom Middle English gostly, gastlich, from Old English gāstlīċ (“spiritual, holy, clerical (not lay), ghastly, ghostly, spectral”), from Proto-West Germanic *gaistalīk (“spiritual”), equivalent to ghost + -ly. Cognate with Scots ghaistly, gaistly (“spiritual, ghastly, terrifying”), West Frisian geastlik (“spiritual, clerical, religious”), Dutch geestelijk (“spiritual, clerical, ecclesiastical”),…

Etymology from Wiktionary, CC BY-SA 3.0