Lightweight

['laɪtweɪt] or ['laɪtwet]

(noun.) a professional boxer who weighs between 131 and 135 pounds.

(noun.) a wrestler who weighs 139-154 pounds.

(noun.) an amateur boxer who weighs no more than 132 pounds.

(adj.) weighing relatively little compared with another item or object of similar use; 'a lightweight fabric'; 'lightweight wood' .

(adj.) having no importance or influence; 'a lightweight intellect' .

詹妮整理--From WordNet