The unpunctual!

Against my will, I have waited and waited... Gritting my teeth, my patience now baited! In a cold sweat, lest again we are late... The time you take, now starts to grate! At the mirror, your face from each angle; Touch-ups all over, my nerves start to jangle! Ever so casual, but the chagrin is mine... Downright....I am, first letter each line! !