a likely to change frequently often without apparent or cogent reason; variable
inconstant affections an inconstant lover swear not by...the inconstant moon"- Shakespeare
Valentino Rossi in USA Today The wind is very inconstant and very strong. You never know what's going to happen with the bike,Rossi said. "Every lap, I look and I say, 'I hope for the red flag, I hope for the red flag.' It was a good decision."
Justin Kaplan in Newsweek The poet spent his early years toiling in and around New York City as what his biographer Justin Kaplan calls "an inconstant newspaper editor, a sometime demagogue, and a writer of imitative fiction."