lightweight

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

(noun) someone who is unimportant but cheeky and presumptuous. Synonyms: whippersnapper, jackanapes.

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

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

(adj) weighing relatively little compared with another item or object of similar use. Examples: "A lightweight fabric." "Lightweight wood."

(adj) having no importance or influence. Example: "A lightweight intellect."