Unneeded
More Than Needed, Too Much
adverb, noun, な adjective
The surplus is measured and it's all unneeded. Yeah, it's definitely more than needed. Maybe we should get rid of all this surplus?
余計 usually carries a negative connotation, meaning there's too much of something, or it's not needed and could be left out. It could be too many things, or unnecessary words or actions it would be better not to say or do.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
このイス、一つ余計だったね。
This is one too many chairs, isn't it?
分かってるよね？余計なことはゼッタイに言わないでね！
You know that, right? Don't say anything unnecessary, okay?
息子から「余計なお世話だ」って言われて、余計にイライラしちゃったんですよね。
My son told me I was meddling too much, and that just made me even more irritated.