The phrase 'an horrible' is not grammatically correct and should not be used in written English.
The correct phrase is 'a horrible', as in, "I had a horrible experience at the store today."
My husband is a physician, and his friend who also is a physician whote the prescription for me after seeing an horrible allergy attack and the trip to the ER for anaphylactic episode.
In the "Psalms," Nelsons found the right balance between otherworldly serenity and earthy vigor: the winds in the second Psalm were flawlessly blended yet pungent in timbre, and the movement's penitential mood ("He brought me up also out of an horrible pit") came through in finely managed swells of dynamics and emotion.
It was an horrible echo of the scenes in 2007 when the Serbian Football Federation were fined £16,000 at the Under-21 European Championships in Holland after their supporters racially abused England's Nedum Onouha.
I sucked—I was an horrible student and I was insecure.
Boswell claimed that Johnson "felt himself overwhelmed with an horrible melancholia, with perpetual irritation, fretfulness, and impatience; and with a dejection, gloom, and despair, which made existence misery".
