Far out is an expression used to indicate something that is unconventional, daring, and exciting. This phrase is typically used by those who want to express their awe or admiration for something that is amazing, astonishing, or unforgettable. Some synonyms for this word include incredible, astounding, amazing, and phenomenal. Other words that may be used in place of "far out" are radical, outrageous, daring, or extreme. These words describe something that is exciting, new, and innovative. No matter what synonyms you choose, they will all evoke feelings of wonder, amazement, and admiration for the uniqueness and creativity of what you are describing.