Meaning of THIN in English

THIN

(WEAK) [adjective] thinner, thinnest - weak or of poor qualitya thin excusethin humoura thin disguisea thin nervous voicea thin smileTo have a thin time (of it) is to have bad or unhappy experiences.He's been having a thin time (of it) since his accident.

Cambridge English vocab.      Кембриджский английский словарь.