Niggle
Definition 1 of 3

Slight Annoyance
Use 'niggle' when irritation is minor and continuous, not for major problems.

The constant clicking of her pen began to niggle at him.
Emotional Impact
'Niggle' suggests a psychological effect, often leading to distraction or frustration.

A nagging doubt niggled at her confidence before the speech.
Compare with
agitationannoyancediscomfortdistresseasefretirritateworry
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