Adénon was born in Abidjan, Ivory Coast. He started his career with Ivorian side ASEC Mimosas, moving to France with Le Mans FC in 2008.[3] He made his senior debut with Le Mans in a Ligue 1 match against AS Nancy on 19 October 2008.[4] He joined Ligue 2 side SC Bastia on loan for the 2009–10 season on 3 July 2009.[5] He returned to Le Mans at the end of the loan, and went on to complete 68 Ligue 1 and Ligue 2 appearances for the club.
On 10 June 2012, Adénon was sent off during a 2014 World Cup qualifier against Rwanda for assaulting the referee. That August, FIFA suspended him from all competition for a year.[6]
With Le Mans bankrupt at the end of the 2012–13 Ligue 2 season, Adénon was effectively a free agent when his ban expired, and in July 2014 he joined Vendée Luçon Football.[7] A year later he was signed by Amiens SC.[8] He was a regular in the team which saw back-to-back promotions in 2015–16 and 2016–17.
Despite signing a new two-year deal with Amiens SC in the summer of 2018, Adénon signed for Saudi Arabian club Al-Wehda in July 2019, agreeing a two-year contract.[9][10] He left by mutual consent in February 2020.[3]
In July 2020, Adénon returned to France with US Avranches, re-uniting with manager Frédéric Reculeau, who had given him a chance at Luçon.[11]