Definition
A behavioural symptom of fatigue in which a person becomes unusually short-tempered, easily annoyed, or quick to react negatively to minor problems, instructors, students, or situations that would not normally provoke such a response.
Plain English
Getting frustrated or snappy more easily than usual — small things start to bother you when they normally wouldn't. In aviation, this is treated as a warning sign that someone is tired, not just having a bad day.
Context Anchor
Seen in aviation human factors discussions, especially when identifying signs of fatigue before or during flight.
Derivation
From the Latin 'irritare', meaning 'to provoke' or 'to excite'. The word describes how easily a person can be 'provoked' into a negative reaction — useful in aviation because fatigue lowers the threshold at which provocation occurs.
Why Pilots Care
Fatigue-induced irritability can degrade crew communication, increase the chance of conflict, and lead to errors in judgment or decision-making.
Grounding Statement
If a normally calm pilot starts reacting sharply to small problems, fatigue may already be affecting performance.
Intuition Check
Irritability does not just mean having a bad personality or being rude. In this context, it can be a warning sign that fatigue is reducing the pilot’s ability to stay calm and think clearly.
Example Sentence 1
The instructor noticed increasing irritability in the student halfway through the long cross-country and decided to land for a break.
Example Sentence 2
Recognizing his own irritability after the long flight, the pilot chose to complete the post-flight checklist more deliberately.