proficient

The word "proficient" is most commonly used with the preposition "in" (e.g., proficient in English) or sometimes "at" (e.g., proficient at coding). It describes a level of skill that is higher than 'basic' but slightly less than 'expert'. It suggests a practical ability to perform a task correctly and efficiently. This term is frequently used in formal contexts, such as on resumes or job applications, to describe professional skills.