Phineus and Tiresias are a couple of prudent old men depicted in Greek mythology.

Sagacious in adapting means to ends; circumspect in action, or in determining any line of conduct; practically wise; judicious; careful; discreet; sensible; -- opposed to rash; as, a prudent man; dictated or directed by prudence or wise forethought; evincing prudence; as, prudent behavior., Frugal; economical; not extravagant; as, a prudent woman; prudent expenditure of money.

prudent is the root

Bruce W. Marcus has written:

'The prudent man' -- subject(s): Law and legislation, Prudent person rule, Pension trusts

'Competing in the new capital markets' -- subject(s): Investment analysis, Capital market

'New dimensions in investor relations' -- subject(s): Corporations, Investor relations

'Competing for clients in the 90s' -- subject(s): Marketing, Professions

Prudent is an adjective.