What term describes the inability to cope with situations not going one's way?

The term that best describes the inability to cope with situations not going one's way is "frustration." Frustration occurs when an individual faces obstacles that prevent them from achieving their goals, leading to feelings of irritability or agitation. While "frustrability" might seem relevant, it is not a commonly recognized term in psychology or emotional descriptions, and it does not convey the state of emotional response to blocked goals as effectively as "frustration." The other options, "aggravation" and "deficiency," do not accurately capture the nuanced emotional response involved in facing unmet expectations or challenges. Aggravation typically relates to annoyance resulting from specific situations, while deficiency points to a lack of something rather than an emotional response to challenges. Thus, frustration is the most accurate term in expressing the difficulty in coping with adverse situations.