adj.
1.having no cogency or legal force
2.no longer valid invalid n.
1.someone who is incapacitated by a chronic illness or injury invalid v.
1.force to retire, remove from active duty, as of firemen
2.injure permanently
Idiom of the Day
ride roughshod over (someone or something)
to treat someone or something with disdain or scorn
The new teacher is riding roughshod over the needs of the students.