The phrase "unconvincing start" means that the beginning of something did not make a strong or persuasive impression and may not lead to success. Full definition
Bayern's slightly unconvincing start to this season, which saw manager Carlo Ancelotti sacked and replaced by Jupp Heynckes, seems to have prompted their stepping up their interest in Sanchez. (caughtoffside.com)
We've scored only one goal and two own goals help us to an unconvincing start. (justarsenal.com)
Chelsea have had an unconvincing start to the season, with a home defeat to Crystal Palace this weekend making it just one win from the Blues» opening four games. (caughtoffside.com)