Definition of unimaginable:
incomprehensible, run riot, unsufferable, unconvincing, imaginings, implausible, unheard of, beyond comprehension, unbelievable, creativity, impossible, thinkable, contrary to all reason, inapprehensible, ineffable, incredible, incredible, improbable, inconceivable, beyond belief, originality, unthinkable, unconceivable, uncompelling, unacceptable, visionary, imaginative, insufferable, out of the question, indescribable, fantastic, belief, a vivid imagination, imagination, creative, unbelievable, incredulous.
I was encouraged to believe he would comprehend this language, unimaginable and inconceivable as such truth is to the mere understanding, for I had in my remembrance a conversation I once overheard between two children, one five and the other not three years old, at which I had not ceased to wonder since I heard it.- "Education in The Home, The Kindergarten, and The Primary School", Elizabeth P. Peabody.
- "En Route", J.-K. (Joris-Karl) Huysmans.
- "The Haunted Bookshop", Christopher Morley.