1. a person who is chronically ill or disabled and unable to work or care for themselves
Usage: dated or formal; often used in historical or medical contexts

1. to make invalid or null; to nullify or cancel
Usage: formal or legal usage

Examples

• The elderly invalider required constant care and attention from family members.
• A single error can invalider an entire contract if not corrected.
• The court's decision will invalider the previous ruling.
• She became an invalider after the accident and spent years recovering.
• New evidence may invalider the defendant's alibi.
• The invalider spent most of his time resting in bed.