wise/whys/why's

wise   (wīz)

Adjective., ^{_{wis·er, wis·est.}}

• Having the ability to discern or judge what is true, right, or lasting; sagacious: a wise leader.
• Exhibiting common sense; prudent: a wise decision.
• Shrewd; crafty.
• Having great learning; erudite.
• Provided with information; informed. Used with to: was wise to the politics of the department.

why   (hwī, wī)

Adjective.

• For what purpose, reason, or cause; with what intention, justification, or motive: Why is the door shut? Why do birds sing?

Conjunction.

• The reason, cause, or purpose for which: I know why you left.

Noun., plural., ^_whys.

• The cause or intention underlying a given action or situation: studying the whys of antisocial behavior.
• A difficult problem or question.

Interjection.

• Used to express mild surprise, indignation, or impatience.