"Thin" in Engpsh is pronounced as /θɪn/.
It originated from Old Engpsh "þynne" and has Germanic origins.
Examples:
She wants to lose weight and become thin. (她想减肥变得瘦。)
The wall is thin and doesn't offer much protection. (这堵墙很薄，不能提供多少保护。)
The ice is too thin to support his weight. (冰太薄不能承受他的体重。)