Indicates that something is almost all or nearly the entire amount; used to mean 'almost', 'nearly', or 'mostly'. Often written in kana.
今日はほとんどの授業がオンラインで行われた。
Most of today's classes were held online.
彼の話はほとんど本当だったが、いくつか細かい間違いがあった。
His story was almost all true, but there were a few small mistakes.
この箱の中にはほとんど何も入っていない。
There's almost nothing in this box.
Used with negative verbs to mean 'hardly', 'barely', or 'scarcely' (e.g., 'ほとんど〜ない' = 'hardly ~').
昨日は忙しくて寝る時間がほとんどなかった。
I was so busy yesterday that I hardly had any time to sleep.
その映画は期待していたほど面白くなく、笑ったのはほとんど一回だけだった。
The movie wasn't as interesting as I expected; I only laughed once or so.
この薬は効果が弱く、痛みはほとんど取れなかった。
This medicine is weak in effect; the pain was hardly relieved.
Used as a noun meaning 'the large majority' or 'the greater part' (can take the particle 'の' to modify other nouns).
参加者のほとんどが会社員だった。
The large majority of participants were company employees.
その問題は学生のほとんどにとって難しかった。
That problem was difficult for most students.
結果はほとんど予想通りだった。
The results were mostly as expected.