Fridayish adjective 1adverb 1forms 2 adjective1 •(informal) Characteristic of Friday, especially as the last day of the working week.There was a Fridayish and Lent-like atmosphere hovering over the spot, and I turned away to watch some youths who were riding surf-boards […] — 1905 adverb1 •(informal) On or around Friday. formsmore Fridayish · most Fridayish