- 1. [adj-na, n] earnestness
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) | ねっせいな | (nesseina) |
| Non-past, plain | ねっせいだ | (nesseida) |
| Non-past, polite | ねっせいです | (nesseidesu) |
| Past, plain | ねっせいだった | (nesseidatta) |
| Past, polite | ねっせいでした | (nesseideshita) |
| Negative, plain | ねっせいじゃない | (nesseijanai) |
| Negative, polite | ねっせいじゃないです | (nesseijanaidesu) |
| Past negative, plain | ねっせいじゃなかった | (nesseijanakatta) |
| Past negative, polite | ねっせいじゃなかったです | (nesseijanakattadesu) |
| Te-form | ねっせいで | (nesseide) |
| Conditional (―nara) | ねっせいなら | (nesseinara) |