ill-founded

Unsubstantiated, not based on fact or evidence.

Japanese Meaning

根拠のない、事実や証拠に基づかない

Her ill-founded assumptions about the project's timeline created unnecessary stress for the whole team.

彼女のプロジェクトのスケジュールに関する根拠のない仮定がチーム全体に不必要なストレスを与えた。

Sense（1）

Unsubstantiated, not based on fact or evidence.

ill-founded criticism

more ill-founded

（ comparative ）

most ill-founded

（ superlative ）