"cautious" in the noun sense
1. timid, cautious
people who are fearful and cautious
"whitewater rafting is not for the timid"
"cautious" in the adjective sense
1. cautious
showing careful forethought never making swift decisions"
"reserved and cautious
"a cautious driver"
2. cautious, conservative
avoiding excess
"a conservative estimate"
Source: WordNet® (An amazing lexical database of English)
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