← BackshareGuessspiffing/ˈspɪfɪŋ/adjectiveExcellent; very good (often used in a slightly old-fashioned or humorous way).He gave a spiffing performance in the school play.We had a spiffing time at the carnival yesterday.That's a spiffing idea — let's go for a picnic!SynonymsterrificexcellentsplendidAntonymsawful