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The phrase "ill at ease" means feeling uncomfortable, uneasy, or anxious. In the context of the sentence, it suggests that the actor is disturbed or uncomfortable due to the nasty comments made by strangers on social media platforms. The negative and hurtful comments have likely affected the actor emotionally, causing a sense of unease or discomfort. This phrase is commonly used to describe a feeling of general discomfort or uneasiness in social situations or due to external factors, as implied by the negative comments on social media in this case.