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 course was slippery in spots and team managers instructed their pilots to
  move cautiously over the oiled paths.
The author even cautiously floats the idea of subsidizing video games as part
  of anticrime policy.
So many feet have stepped cautiously to the edge of major overlooks that in
  places the rock has been polished smooth.
Birch knew, however, that such interpretations should be made cautiously.
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