n. 25B6; noun
she tried not to show her irritation : ANNOYANCE, exasperation, vexation, indignation, impatience, crossness, displeasure, chagrin, pique; anger, rage, fury, wrath; informal aggravation; poetic/literary ire.
I realize my presence is an irritation for you : IRRITANT, annoyance, thorn in someone's side/flesh, bother, trial, torment, plague, inconvenience, nuisance; informal aggravation, pain (in the neck), headache; N. Amer. informal nudnik, burr in/under someone's saddle; Austral./NZ informal nark.
delight.