Possible Clues:

• Nervous - like volcanologist here?
• Understandably, one is nervous here
• Single senior manager meeting employee's leader is nervous
• Nervous and tense - close to cliff?
• Maybe irritable person starts to denigrate 'Great Expectations'
• Nervous and tense
• Nervous or tense
• Tense and irritable, with nerves stretched
• Tense and irritable, very nervous
• Not relaxed