1. erratic and unpredictable in behavior or direction
Usage: formal; literary

Examples

• The vagarious weather made it impossible to plan outdoor activities.
• His vagarious moods kept everyone guessing about his true feelings.
• The river followed a vagarious course through the mountains.
• Her vagarious artistic style defied easy categorization.
• The stock market’s vagarious movements frustrated investors.
• The professor’s vagarious teaching methods confused some students.