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one word meaning lacking detail depending on the context of its use would be "spacey." as in "that explanation was kinda spacey." ~VAGUE is a good word meaning "Lacking Detail"~
The movie was really lacking in plot and originality.
Words that mean 'lacking enthusiasm' are lackadaisical or apathetic.
The word is "inexperienced."
Apodal is the answer to this.
purposeless
The opposite of noble is ignoble, which means lacking honor or moral principles.
The word is narrowness. It means not wide.
The word "colorless" includes a suffix ("-less") that means lacking or without.
Untrustworthy
Unmanned
weak or powerless.