Feckly, a word that is now obsolete, means efficiently or effectively. Synonyms for feckly include ably, competently, efficiently, effectually, proficiently, skilfully and successfully. These words convey the sense of a job or task being done with skill and efficiency. Today, feckly is largely unused, with contemporary language preferring words that are more commonly used and easily understood. Despite its lack of usage in modern language, feckly still retains its meaning and can be used to add a classic and literary flair to written works. By understanding synonyms for feckly, writers can effectively communicate the sense of competence and efficiency to their readers.