fallible

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It's May! Or is it "might"? Settle the dispute with our
Concise Dictionary of English Usage.
http://www.merriam-webster.com/cgi-bin/book.pl?conusg.htm&6
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The Word of the Day for May 6 is:

fallible   \FAL-uh-bul\   adjective
     1 : liable to be erroneous 
    *2 : capable of making a mistake

Example sentence:
     As a little girl, Lucy idolized her father and believed he 
was always right, but as she got older, she realized that he was 
a fallible person who made mistakes like everyone else.

Did you know? 
     "Errare humanum est."  That Latin expression translates 
into English as "To err is human." Of course, cynics might say 
that it is also human to deceive. The word "fallible" 
simultaneously recognizes both of these human character flaws. 
In modern usage, it refers to one's ability to err, but it 
descends from the Latin verb "fallere," which means "to 
deceive." "Fallible" has been used to describe the potential for 
error since at least the 15th century. Other descendants of the 
deceptive "fallere" in English, all of which actually 
predate "fallible," include "fallacy" (the earliest, now 
obsolete, meaning was "guile, trickery"), "fault," "false," and 
even "fail" and "failure."

*Indicates the sense illustrated in the example sentence.