Capable of making an error: Humans are only fallible. (adjective)
Tending or likely to be erroneous: fallible hypotheses. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "fallible" in a sentence
"I find, in other words, the best human beings fallible, and _very fallible_."
"And the bottom line is, I'm not the first one who said that the emperor has no clothes and that "The New York Times" is fallible, which is perfectly reasonable -- fallible just like every other corporation or government or whatever it is."
"But regulators and supervisors are fallible, which is why we need to attack the problems from all sides."