The garden's design is very restful, making people feel relaxed.

restful 是形容词，由名词 rest（休息）加上后缀 -ful（充满...的）构成，字面意思是"充满休息感的"，引申为"宁静的、让人放松的"。 在句中描述花园设计给人带来的感受，强调能让人平静、舒缓压力的特质。