different between grounded vs grinded

English

grounded (comparative more grounded, superlative most grounded)

(aviation, of an airman) Not allowed to fly.
(of a person, predicative) Confined to stay inside, typically by a parent, as a punishment.
(of a person) Mature, sensible with well-considered priorities.
(electricity, Canada, US) Of or pertaining to an electrical conductor which is connected to earth; earthed.

grounded

grinded

(nonstandard) simple past tense and past participle of grind
- 2013 (printed; original 1795), American Antiquarian Cookbook Collection, One Thousand Valuable Secrets, in the Elegant and Useful Arts: Collected from the Practice of the Best Artists and Containing an Account of the Various Methods, Andrews McMeel Publishing (?ISBN)
  Make a color composed of brown red, and a little flat, or Venetian lake, previously grinded with gum adragant.
(video games) simple past tense and past participle of grind

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