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vig·i·lant

vigilant

 
pronunciation:
vI j lnt
features:
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part of speech: adjective
definition: alert and careful about danger.
The duty of a lifeguard is to be vigilant.
synonyms:
alert, attentive, cautious, wary, watchful
similar words:
on guard, prudent
derivation: vigilantly (adv.)
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  care