There are many synonyms for the phrase "be happy beyond description," each conveying a sense of overwhelming joy and elation. Some of these synonyms include ecstatic, overjoyed, delighted, thrilled, elated, euphoric, jubilant, and exultant. Each of these words captures the feeling of being so happy that it is difficult to put into words. Whether it's a moment of achievement, an unexpected surprise, or simply being in the presence of someone you love, these synonyms encapsulate the purest form of happiness. So, no matter what words you use to describe it, being happy beyond description is one of the greatest feelings in life.