The phrase "in blue funk" can be described as feeling sad, depressed or anxious. An antonym for this would be feeling happy, elated or content. Being in a good mood or feeling joyous are antonyms for the phrase. Feeling optimistic or hopeful, instead of being worried or anxious, is also a suitable antonym. Remaining calm and composed, rather than being overwhelmed with anxiety, is another opposite of the phrase. Essentially, any emotion or feeling that represents the opposite of feeling down or low can be considered an antonym for "in blue funk".