Unwelcome Acknowledgment is a term used to describe a situation in which someone receives a negative response or reaction to something they have said or done. In this case, the crossword solution for Unwelcome Acknowledgment is 'SNEER, ' which is defined as a facial expression of contempt or scorn. A SNEER can be seen as an unwelcoming acknowledgment of someone's words or actions, as it implies that the speaker or actor is not worthy of respect.