unimaginable

From un- +‎ imagine +‎ -able.

• IPA^(key): /ˌʌnɪˈmædʒɪnəbəl/

• Audio (Southern England):

  (file)

unimaginable (comparative more unimaginable, superlative most unimaginable)

1. Unable to be imagined; inconceivable or mind-boggling; beyond belief.
   • 2007 November 18, Jim Holt, “Mind of a Rock”, in New York Times‎^[1]:

     But at the microlevel it consists of an unimaginable number of atoms connected by springy chemical bonds, all jiggling around at a rate that even our fastest supercomputer might envy.

• imaginable

• unimaginability
• unimaginably