lightweight

adjective
1
made of thinner material and less heavy than usual
سبک‌وزن, کم‌وزن, سبک
2
not very serious or impressive
غیرجدی, کم‌اهمیت, کم‌ارزش, پیش پا افتاده
a lightweight book
He was considered too lightweight for the job.
noun
1
a weight in boxing and other sports, between featherweight and welterweight, in boxing usually between 57 and 60 kilograms; a boxer or other competitor in this class
سبک‌وزن, بوکسور سبک وزن, ورزشکار سبک وزن
2
a person or thing that weighs less than is usual
سبک‌وزن, کم‌وزن
3
a person or thing of little importance or influence
بی‌اهمیت, بی‌نفوذ, کم‌نفوذ
a political lightweight
He's an intellectual lightweight .