unimaginable (adjective) unimaginable: mind-boggling
Sinonime: beyond wildest dreams,
doubtful,
exceptional,
extraordinary,
fantastic,
impossible,
improbable, inapprehensible, incogitable,
incomprehensible,
inconceivable,
incredible,
indescribable,
ineffable, not understandable,
rare,
singular,
unbelievable,
uncommon, unheard-of,
unique, unknowable, unordinary, unthinkable
Antonime: believable, describable, imaginable