The term 'with merriment' can be expressed in two different ways, using the crossword solutions of 'GAILY' and 'gayly'. Both words are adverbs that describe a cheerful or lively manner. GAILY is derived from the Middle English word 'gaili', which means joyous or merry, while gayly is derived from the Old French word 'gaie', which means joyous or merry. Both words are used to express a feeling of joy and happiness.