a. Impossible to calculate: an incalculable number of ants.
b. Too great to be calculated or reckoned: incalculable suffering.
2. Impossible to foresee; unpredictable: "The motions of her mind were as incalculable as the flit of a bird" (Edith Wharton).
Synonyms: incalculable, countless, immeasurable, incomputable, inestimable, infinite, innumerable, measureless
These adjectives mean being greater than can be calculated or reckoned: incalculable riches; countless hours; an immeasurable distance; an incomputable amount; jewels of inestimable value; an infinite number of reasons; innumerable difficulties; measureless power.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.