- 1. [adj-na] {math} reducible (e.g. fraction, polynomial)
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) | かやくな | (kayakuna) |
| Non-past, plain | かやくだ | (kayakuda) |
| Non-past, polite | かやくです | (kayakudesu) |
| Past, plain | かやくだった | (kayakudatta) |
| Past, polite | かやくでした | (kayakudeshita) |
| Negative, plain | かやくじゃない | (kayakujanai) |
| Negative, polite | かやくじゃないです | (kayakujanaidesu) |
| Past negative, plain | かやくじゃなかった | (kayakujanakatta) |
| Past negative, polite | かやくじゃなかったです | (kayakujanakattadesu) |
| Te-form | かやくで | (kayakude) |
| Conditional (―nara) | かやくなら | (kayakunara) |