His decisions are capricious and not based on sound judgement. The weather in March is capricious: as Mark Twain said, if you don't like it, just wait five minutes.
Advanced English Dictionary
+adjective (formal) 1 showing sudden changes in attitude or behaviour: a movie star who was capricious and difficult to please 2 changing suddenly and quickly: a capricious climate capriciously adverb capriciousness noun [U]
Random quote: It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.: Franklin D. Roosevelt