The term 'At Ease (Uncomfortable)' can be represented by the three letter acronym 'ILL'. This acronym is used to describe a feeling of unease or discomfort. It is often used to describe a situation in which someone is feeling uneasy or uncomfortable due to a lack of familiarity or understanding of a particular situation. The term can also be used to describe a feeling of unease or discomfort caused by a physical or mental condition.