showing, using, or characterized by caution: a cautious man; To be cautious is often to show wisdom.

1630–40; cauti(on) + -ous

cautiously, adverb
cautiousness, noun
hypercautious, adjective
hypercautiously, adverb
hypercautiousness, noun
supercautious, adjective
ultracautious, adjective
ultracautiously, adverb
ultracautiousness, noun
uncautious, adjective
uncautiously, adverb
uncautiousness, noun

prudent, guarded, wary, chary, circumspect, watchful, vigilant. See careful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cautious (ˈkɔːʃəs)
showing or having caution; wary; prudent

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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Word Origin & History

c.1640, from caution + -ous. Related: Cautiously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The consequence is that his exploration of human woes will, henceforth, be
  guarded and cautious.
Reading this book will keep you eyeing the shoots of modern elections with a
  cautious glance.
One cautious tip for any visitors suffering from seasonal allergies.
Know prudent, cautious, self-control is wisdom's root.
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