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Gaiety: noun - cheerfulness, mirth, frivolity, merrymaking.
Sadness: noun - the condition of being sad. Sad: adjective - sorrowful, mournful.
'Between evocative crashing of breakers on the sand, the hungry cries of the seagulls, and the light soughing of the onshore breeze, Jake could hear the gaiety of the beach party he approached, as they played, laughed, danced and ate around their driftwood bonfire.'
Personal note: I think it's rather sad that, as writers, we've lost the use of the word 'gay', which was such an evocative adjective for which there is no real synonym. Nothing against the gay community; just a tinge of regret that they chose that particular word as a label.
'Walking the shore, just out of reach of crashing breakers, feeling the lonely cries of gulls and allowing the offshore breeze to tangle her blonde tresses, Faith felt the deep sadness of her separation from all that she knew and loved in the world.'