1 unhappy because you are not with other people 孤寂的；寂寞的: to feel sad and lonely 感到悲伤和寂寞

2 (used about a situation or a period of time) sad and spent alone （指情况或一段时间）悲哀寂寞的，孤寂的

3 (only before a noun 只用于名词前) far from other people and places where people live 偏僻的；人迹罕至的 ☞ Look at the note at alone. 参看alone的注释。 ➔loneliness noun [U] ☞Compare solitude and isolation. 与solitude及isolation比较。