Stiff
inflexible / rigid / unyielding / fixed / stubborn
There are many more depends who or what you are talking about.
The word that means lacking flexibility is "rigid."
I think you are indicating the word "deficient" which means "lacking something."
The word incompetent means the lacking of qualification or being incapable, inadequate, unable or unsuitable. It is the opposite of the term competent.
The French word "complète" means "complete" in English. It is used to describe something that is whole, finished, or lacking nothing.
Abandoned
No, the word flexible is a adjective a the noun for flexible is flexibility.
Untrustworthy
The word is narrowness. It means not wide.
an- means not, without, or lacking. esthesia means capacity for sensation or feeling; sensitivity.anestesia means without/lacking feeling or sensation.
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"~
nothing
..Empty? Bare? Lacking?..
static
Atonal
hollow
The word oblivious is an adjective. It means to be lacking awareness.
I think you are indicating the word "deficient" which means "lacking something."
A good word would be ignorant. It means lacking knowledge about something.