lightweight
[adjective]
Synonyms: unimportant, inconsequential, insignificant, paltry, petty, slight, trifling, trivial, worthless

[TahlilGaran] English Synonym Dictionary ▲

I. light‧weight¹ /ˈlaɪt-weɪt/ noun [countable]

1. someone who has no importance or influence, or who does not have the ability to think deeply – used to show disapproval Antonym : heavyweight:
an intellectual lightweight

2. a boxer who weighs less than 61.24 kilograms, and who is heavier than a featherweight but lighter than a welterweight

3. someone or something of less than average weight

[TahlilGaran] Dictionary of Contemporary English ▲

II. lightweight² adjective

1. weighing less than average Synonym : light:
a torch made from lightweight plastic

2. lightweight clothing or material is thin, so you can wear it in warm weather:
a lightweight jacket

3. showing a lack of serious thought – used to show disapproval:
a lightweight novel

[TahlilGaran] Dictionary of Contemporary English ▲