irritieren
to confuse
To confuse, unsettle, or disturb someone so that their concentration or well-being is affected.
Die widersprüchlichen Anweisungen haben mich völlig irritiert.
The contradictory instructions completely confused me.

to confuse / irritate
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to confuse
To confuse, unsettle, or disturb someone so that their concentration or well-being is affected.
Die widersprüchlichen Anweisungen haben mich völlig irritiert.
The contradictory instructions completely confused me.

The context makes the meaning clear. If it is about thoughts, feelings, or concentration, 'irritieren' means 'to confuse'. If it is about the body (skin, eyes), physical irritation is meant.
Sein plötzliches Schweigen irritierte die ganze Gruppe.
His sudden silence confused the whole group.
The verb 'irritieren' always needs an accusative object. The person or body part that is confused or irritated is in the accusative.
Deine Frage irritiert mich ein wenig.
Your question confuses me a little.
In German, 'irritieren' often means 'to confuse' or 'to unsettle'. It is weaker than the English 'to irritate', which usually means 'to annoy' or 'to get on someone's nerves'.
Die ungewöhnliche Architektur des Gebäudes irritiert viele Besucher.
The building's unusual architecture confuses many visitors.
The participles are often used as adjectives. 'Irritierend' (confusing) describes something that causes confusion. 'Irritiert' (confused) describes a person's feeling.
Ich finde sein Verhalten sehr irritierend.
I find his behavior very confusing.
to disturb / bother
'stören' and 'irritieren' can both describe something affecting a person in an unpleasant way. 'stören' is broader and fits interruptions, noise, or things that are annoying. 'irritieren' more often means that someone is confused, unsettled, or thrown off internally. The words are easy to confuse because something irritating often also bothers you. If it is mainly about peace and quiet or concentration, 'stören' is more natural. If someone is not sure what is going on, or feels strangely affected by something, 'irritieren' fits better.

Die kurze Antwort des Mitarbeiters hat mich im Gespräch irritiert.
The employee's brief answer confused me during the conversation.
Der Baulärm vor dem Fenster stört den Unterricht.
The construction noise outside the window is disrupting the lesson.