Similar in meaning but less intense:
* Irritated: This is a common and generally neutral synonym.
* Annoyed: Similar to irritated, but perhaps a bit more mild.
* Disgruntled: Suggests a feeling of dissatisfaction or resentment.
* Peeved: A bit more informal and implies a slight annoyance.
More intense synonyms:
* Infuriated: This implies a strong feeling of anger.
* Enraged: Similar to infuriated, but possibly even more intense.
* Provoked: This suggests that something has deliberately been done to cause annoyance.
* Outraged: This implies a sense of injustice or indignity.
More specific synonyms:
* Stung: This implies a feeling of being hurt or offended.
* Embarrassed: This implies a feeling of awkwardness or shame.
* Humiliated: This implies a feeling of intense shame or degradation.
Ultimately, the best synonym for "nettled" depends on the specific situation and the level of intensity you want to express.