na-adjective
extra; more than needed; excessive
Describes a quantity or degree that is beyond what is necessary or expected; often carries a negative nuance of being too much.
砂糖を余計に入れすぎた。
I put in too much sugar.
余計なものは買わないで。
Don't buy unnecessary things.
na-adjective
unnecessary; uncalled-for; unwanted
Used for actions, remarks, or interference that are not needed and often annoying; implies something is better left unsaid or undone.
余計なことを言わないでください。
Please don't say unnecessary things.
彼はいつも余計な口出しをする。
He always makes uncalled-for remarks.
adverb
Adverbial use meaning 'on top of that' or 'to make matters worse'; often used when an additional factor intensifies a situation, frequently in negative contexts.
雨が降って、余計に寒く感じる。
It's raining, which makes it feel even colder.
説明を聞いたら、余計にわからなくなった。
After hearing the explanation, I became even more confused.