Cautious

google

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mid 17th century: from caution, on the pattern of pairs such as ambition, ambitious .

wiktionary

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caution(“from Latin  cautus”) +‎  -ous

etymonline

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cautious (adj.)

"careful to avoid danger or misfortune," 1640s, from caution + -ous. The Latin word for this was cautus "careful, heedful." Related: Cautiously; cautiousness.