Fritterer is a noun that refers to someone who wastes their time on trivial or unimportant things. While there are no official antonyms for this word, some opposite terms might be "dedicated," "productive," "efficient," or "frugal." A person who is dedicated uses their time wisely and puts effort into meaningful activities. A productive individual is goal-oriented, creates value, and achieves results. Efficiency focuses on making the best use of time and resources, avoiding waste and redundancy. Frugality, on the other hand, is the quality of being economical and avoiding waste. These antonyms, by contrast, connote constructive and useful pursuits, in opposition to the fritterer, who indulges in idle hobbies or aimless distractions.