"lightweight" in the noun sense
1. lightweight
a professional boxer who weighs between 131 and 135 pounds
2. whippersnapper, jackanapes, lightweight
someone who is unimportant but cheeky and presumptuous
3. lightweight
an amateur boxer who weighs no more than 132 pounds
4. lightweight
a wrestler who weighs 139-154 pounds
"lightweight" in the adjective sense
1. lightweight
weighing relatively little compared with another item or object of similar use
"a lightweight fabric"
"lightweight wood"
2. lightweight
having no importance or influence
"a lightweight intellect"
Source: WordNet® (An amazing lexical database of English)
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