FECKLESS

weak and ineffective

irresponsible

/not fit to assume responsibility

generally incompetent and ineffectual

"feckless attempts to repair the plumbing."

SYN - inept
ANT - responsible

"She had dumped him because he was feckless especially when it came to lovemaking."

"The company couldnt afford to keep such feckless workers around and immediately fired the weak and ineffective employees."

"It was a rather feckless attempt to save his relationship, which resulted in her growing further apart from him."