Select the INCORRECTLY spelt word.

The incorrectly spelt word in the given options is "Recalcitrent." The correct spelling is "Recalcitrant."

Here are the correct spellings and definitions of the words:

• Lapse: A temporary failure or slip in concentration or behavior.
• Recalcitrant: Resisting authority or control; stubbornly disobedient.
• Acquit: To declare someone not guilty of a criminal charge or to fulfill one's responsibilities or duties.
• Mourning: The expression of deep sorrow or grief, especially over someone's death.