UNBELIEVABLE

Pronunciation (US):

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 Dictionary entry overview: What does unbelievable mean? 

• UNBELIEVABLE (adjective)
  The adjective UNBELIEVABLE has 2 senses:

1. beyond belief or understanding

2. having a probability too low to inspire belief

  Familiarity information: UNBELIEVABLE used as an adjective is rare.

 Dictionary entry details 

• UNBELIEVABLE (adjective)

Sense 1

Meaning:

Beyond belief or understanding

Synonyms:

incredible; unbelievable

Context example:

the book's plot is simply incredible

Similar:

astounding; dumbfounding; dumfounding (bewildering or striking dumb with wonder)

fabulous (barely credible)

improbable; marvellous; marvelous; tall (too improbable to admit of belief)

undreamed; undreamed of; undreamt; undreamt of; unimagined (not imagined even in a dream)

Also:

flimsy; unconvincing (not convincing)

incredulous (not disposed or willing to believe; unbelieving)

implausible (having a quality that provokes disbelief)

unthinkable (incapable of being conceived or considered)

Attribute:

believability; credibility; credibleness (the quality of being believable or trustworthy)

Sense 2

Meaning:

Having a probability too low to inspire belief

Synonyms:

improbable; unbelievable; unconvincing; unlikely

Similar:

implausible (having a quality that provokes disbelief)

 Context examples 

This was the most unbelievable part of the entire episode!

(AstrologyZone.com, by Susan Miller)

Running modelling to see how this magnesium (and other elements) could have vanished, the team calculated something almost unbelievable: up to 40 percent of the mass of Earth could have evaporated in repeated episodes of vaporization as the planet forged in fire.

(Fiery Collisions That Gave Birth to Earth Could Have Evaporated 40% of Our World, The Titi Tudorancea Bulletin)

Perhaps some unbelievable guest would arrive, a person infinitely rare and to be marvelled at, some authentically radiant young girl who with one fresh glance at Gatsby, one moment of magical encounter, would blot out those five years of unwavering devotion.

(The Great Gatsby, by F. Scott Fitzgerald)