Etymology
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advisable (adj.)

1640s, "prudent, expedient," from advise (v.) + -able (q.v.). It also can mean "open to advice" (1660s), but this is rare.

updated on November 12, 2016

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Definitions of advisable from WordNet

advisable (adj.)
worthy of being recommended or suggested; prudent or wise;
extreme caution is advisable
it is advisable to telephone first
such action is neither necessary nor advisable
From wordnet.princeton.edu, not affiliated with etymonline.