Which term best describes someone with an ornery disposition?

The term "ornery" is commonly used to describe someone who is ill-tempered, difficult, or contrary in nature. When someone has an ornery disposition, they tend to be cranky, irritable, or likely to be difficult to deal with. Thus, the phrase "having a difficult and contrary disposition" accurately captures the essence and connotations of the term.

The other choices do not align with the meaning of "ornery." Describing someone as cheerful and agreeable reflects a positive and pleasant demeanor, which contrasts sharply with the negativity associated with being ornery. Similarly, being helpful and supportive denotes a willingness to assist others and a friendly attitude, again opposing the nature of an ornery person. Lastly, calm and collected signifies a serene and composed attitude, which is also at odds with the challenging temperament implied by being ornery.