self-sustaining vs unable

self-sustaining

adj
  • Able to sustain itself without the need for additional fuel. 

  • Opposing or rejecting exterior influence; independent. 

  • Able to provide for one's own needs without help from others; self-sufficient. 

unable

verb
  • To render unable; to disable. 

intj
  • Indicating that a requested course of action is not possible to carry out. 

adj
  • Not able; lacking a certain ability. 

How often have the words self-sustaining and unable occurred in a corpus of books? (source: Google Ngram Viewer )