invaluable

/ɪnˈvælju(ə)bl̩/adjective

So useful or precious that its worth cannot be measured.

Example sentence

“Her advice proved invaluable during the move.”

Means extremely valuable, not the opposite. The 'in-' here does not negate, a trap this word shares with 'inflammable'.

Related words

inventoryThe quantity of goods a business or location currently holds in stock.invalidateTo make something no longer valid or legally binding, especially a contract or ruling.invincibleImpossible to beat or conquer.inundateTo flood a place with water, or to overwhelm someone or something with a huge amount.invoiceA document a seller sends to a buyer listing the goods or services supplied, their quantities, and the amount owed.intuitiveUnderstood or done naturally, without needing conscious thought.