having no bounds; infinite or vast; unlimited: His boundless energy amazed his friends.

1585–95; bound3 + -less

boundlessly, adverb
boundlessness, noun

limitless, endless, unbounded, inexhaustible, illimitable. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boundless (ˈbaʊndlɪs)
unlimited; vast: boundless energy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The boundless dimensions of math and physics an endless source of fascination.
Once you're in the application phrase of your search, the opportunities to harm
  your candidacy with your own words are boundless.
The smartest people in the world stand always in the presence of their own
  boundless ignorance.
We have read your manuscript with boundless delight.
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