What word best completes the sentence: "Stop sitting there looking so bored and ____________. Get up and find something to do!"?

The correct completion of the sentence is "enthusiastic." This word indicates a sense of eagerness and excitement, which directly contrasts with the initial state of looking bored. The sentence encourages the listener to shift their attitude from passivity to active engagement. By using "enthusiastic," it implies that the person should have a positive and proactive mindset, which aligns perfectly with the call to action in the latter part of the sentence that suggests getting up and finding something to do.

In this context, alternatives like "unenthusiastic" would reinforce the bored demeanor, and "boredom" is a noun that lacks the required grammatical function in this sentence. "Excited," while somewhat appropriate, does not capture the broader eagerness and positive energy conveyed by "enthusiastic." Overall, "enthusiastic" best conveys the intended message of encouragement to embrace an active and vibrant approach to the moment.