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A specific scientific inquiry concerning the degree to which iron(III) hydroxide, a highly insoluble reddish-brown precipitate, dissolves in a solvent, typically water, under varying pH or temperature conditions.

“The student struggled with the iron(III) hydroxide solubility question on the chemistry final exam.”

Incapable of being brought into harmony or compromise; so incompatible as to make a resolution or agreement impossible.

“The business partners had irreconcilable differences that ultimately led to the dissolution of the company.”

In a manner that is impossible to refute or disprove; undeniably.

“The DNA evidence irrefutably linked the suspect to the crime scene.”

Not conforming to normal rules, laws, or standard procedures; lacking symmetry, evenness, or a predictable pattern.

“The ancient stone wall was built using stones of irregular sizes and shapes.”

Impossible to cure, repair, correct, or remedy; permanent and irreversible.

“The prolonged drought caused irremediable damage to the region's agricultural soil.”

Impossible to repair, rectify, or amend; causing damage or loss that cannot be reversed or made right.

“The sudden stock market crash caused irreparable damage to his retirement savings.”

The state or quality of being unreliable, untrustworthy, or failing to fulfill one's obligations and duties.

“His sheer irresponsibility in handling the company's finances led to a massive deficit.”

Showing a lack of respect for people or things that are generally taken seriously.

“The comedian made irreverent jokes about the royal family.”

Having or showing a tendency to be easily annoyed or angered.

“Losing sleep can make people feel tired and irritable during the day.”

To annoy, provoke, or make someone slightly angry.

“His constant humming began to irritate his coworkers.”

The state of feeling annoyed, impatient, or slightly angry.

“He could not hide his irritation at the constant interruptions during the meeting.”

A mathematical inquiry asking whether the product of 81 multiplied by itself (6,561) belongs to the set of numbers that can be expressed as a fraction of two integers.

“The student asked, 'Is 81 squared a rational number?' to confirm their understanding of integer properties.”

A scientific inquiry regarding the classification of apple juice as a heterogeneous or homogeneous mixture rather than a chemically pure substance.

“The student asked, 'Is apple juice classified as a mixture or a pure substance explain?' during the chemistry lab.”

A common inquiry regarding whether the plot of Ian McEwan's novel 'Atonement' is a historical account rather than a work of fiction.

“Many readers ask, 'is Atonement based on real events' because the depiction of the Dunkirk retreat is so historically detailed.”

In French, the most common word for hair on the head, 'cheveux' (always used in the plural), is masculine. For body hair or a single strand of hair, the word 'poil' is also masculine.

“The question 'Is hair masculine or feminine in French?' addresses a common point of confusion for learners of French grammar.”