Lightweight
Part of speech: noun
Definition: A boxer in a weight division having a maximum limit of 135 pounds for professionals and 132 pounds for amateurs. A competitive weight division between bantamweight and welterweight, with specific weights varying by organization. One of little consequence or ability. A person who can't handle their drink. A political candidate with little chance of winning
Part of speech: adjective
Definition: Lacking in earnestness, ability, or profundity Having less than average weight
Example sentence: Anonymous blog comments, vapid video pranks and lightweight mash-ups may seem trivial and harmless, but as a whole, this widespread practice of fragmentary, impersonal communication has demeaned personal interaction.
Unimportant
Part of speech: adjective
Definition: petty; not important or noteworthy
Example sentence: Anything that isn't opposed by about 40 percent of humanity is either an evil business or so unimportant that it simply doesn't matter.