“Weightless” (** out of four) was a stillborn melodrama about a middle-aged loner (Alessandro Nivola) whose solitary life and existence is interrupted by the arrival of his 10-year old son (Eli Haley) who he has never met but the boy’s physical and psychological needs prove to be difficult for them both to handle. Beautifully shot by Darren Lew in Johnstown, NY and features some scattered effective moments but too morose and languid to garner any momentum or dramatic fire. Johnny Knoxville is good in an unusual role as Nivvola’s boss.