- 1. [adj-na, adj-no, n] {math} irreducible
Conjugation — Adjective (―na)
This word itself does not change -- these are forms of the copula だ ("to be") attached to it.
| Attributive (before a noun) | きやくな | (kiyakuna) |
| Non-past, plain | きやくだ | (kiyakuda) |
| Non-past, polite | きやくです | (kiyakudesu) |
| Past, plain | きやくだった | (kiyakudatta) |
| Past, polite | きやくでした | (kiyakudeshita) |
| Negative, plain | きやくじゃない | (kiyakujanai) |
| Negative, polite | きやくじゃないです | (kiyakujanaidesu) |
| Past negative, plain | きやくじゃなかった | (kiyakujanakatta) |
| Past negative, polite | きやくじゃなかったです | (kiyakujanakattadesu) |
| Te-form | きやくで | (kiyakude) |
| Conditional (―nara) | きやくなら | (kiyakunara) |