How to say "Useless" in Japanese

When translating "useless" into Japanese, you must choose carefully between 無駄な and 詮無きこと. In Japanese, 無駄な (むだな (mudana)) is typically associated with "useless, wasteful, futile, in vain" (Syllabus Level: N4) and represents This is a な-adjective used to describe something that is without purpose, effectiveness, or value, often implying wastefulness of time, effort, or money. It can be used directly before a noun. On the other hand, 詮無きこと (せんなきこと (sennakikoto)) maps to "useless; futile; pointless; of no avail" (Syllabus Level: N1) and represents A somewhat archaic or literary expression meaning something is pointless or cannot be helped. Often used in the form「詮無い」or「詮無きこと」.. A literal translation of "useless" can often sound unnatural to native Japanese speakers if mixed up!