ill-founded

His ill-founded fears kept him from enjoying the trip.

Definition

1. Adjective:
   • Lacking a valid basis or justification: "ill-founded" describes something that is not supported by facts, evidence, or sound reasoning; it is based on weak or false premises.

Usage Examples

• (The accusation had no factual basis.)
• (Her fears were not supported by reality.)
• (A rumor without evidence can lead to unwarranted alarm.)

Advanced Usage

• "ill-founded optimism": optimism that is not justified by the situation.

  • Despite the company's losses, his ill-founded optimism led him to invest more money. (His optimism was based on false hopes.)

• "ill-founded criticism": criticism that lacks a reasonable basis.

  • The reviewer's ill-founded criticism of the novel ignored its literary merits. (The criticism was unfair and unsupported.)

Variants and Related Words

• Well-founded (adj) (antonym): based on good evidence or reasoning.

  • Her concerns were well-founded, as the data showed a clear trend. (Her concerns had a solid basis.)

• Unfounded (adj): having no foundation or basis in fact (synonym of ill-founded).

  • The allegations were entirely unfounded. (There was no evidence for them.)

Synonyms

• Baseless: without any foundation or justification.
• Groundless: lacking a valid reason or cause.
• Unsubstantiated: not supported by evidence.

Related Idioms

• Built on sand: based on a weak or unreliable foundation.

  • His entire argument is built on sand — it's ill-founded. (The argument lacks solid support.)

• Without foundation: lacking any factual basis.

  • The rumor was without foundation, making it ill-founded. (The rumor had no truth to it.)