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extra; more; too much; too many; excessive; superfluous; spare; surplus
unnecessary; needless; uncalled-for; unwanted; uninvited
all the more; even more
余計なお世話かもしれないけど言わせて。
It might be none of my business but let me say this.
余計なことを言ってしまって後悔している。
I regret saying unnecessary things.
余計な心配をするな。
Don't worry unnecessarily.