- 1. [adj-na, adj-no, n] correct; proper; formal; regular; systematic; normal
- 2. [adj-na, adj-no] {math} invertible (matrix); holomorphic
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) | せいそくな | (seisokuna) |
| Non-past, plain | せいそくだ | (seisokuda) |
| Non-past, polite | せいそくです | (seisokudesu) |
| Past, plain | せいそくだった | (seisokudatta) |
| Past, polite | せいそくでした | (seisokudeshita) |
| Negative, plain | せいそくじゃない | (seisokujanai) |
| Negative, polite | せいそくじゃないです | (seisokujanaidesu) |
| Past negative, plain | せいそくじゃなかった | (seisokujanakatta) |
| Past negative, polite | せいそくじゃなかったです | (seisokujanakattadesu) |
| Te-form | せいそくで | (seisokude) |
| Conditional (―nara) | せいそくなら | (seisokunara) |