十分
じゅうぶん
enough
na-adjective
Conjugation Table
Present
十分だ
Negative
十分じゃない
Past
十分だった
Past Negative
十分じゃなかった
Te Form
十分で
Adverbial
十分に
Conditional
十分なら
Presumptive
十分でしょう
Example Sentences
このお金は十分です。
This money is enough.
Kono okane wa jūbun desu.
昨日の晩ご飯は十分ではありませんでした。
Last night's dinner was not enough.
Kinō no bangohan wa jūbun de wa arimasen deshita.
時間が十分で、ゆっくり話しましょう。
We have enough time, so let's talk slowly.
Jikan ga jūbun de, yukkuri hanashimashō.
Grammar Notes & Usage Tips
•Particle Pairing**: When using 十分 (じゅうぶん) as a na-adjective, remember to pair it with the particle な before a noun, like in 十分な時間 (じゅうぶんなじかん) meaning "enough time."
•Adverbial Use**: 十分 can also be used as an adverb meaning "sufficiently" or "adequately." In this case, it doesn't need any particles and can directly modify verbs, as in 十分食べました (じゅうぶんたべました), meaning "I ate enough."
•Common Mistake**: Don’t confuse 十分 (じゅうぶん) with 少ない (すくない) which means "few" or "insufficient." 十分 indicates adequacy, so it conveys the opposite meaning.
•Negative Form**: To express "not enough," use the negative form 十分ではない (じゅうぶんではない) or 十分じゃない (じゅうぶんじゃない), as in 十分じゃないお金 (じゅうぶんじゃないおかね), meaning "not enough money."
•な-adjective: Uses な before nouns, conjugates like a noun