- 1. [adj-na, n] stupid; half-witted; dull-witted; thickheaded (uk)
- 2. [n] blockhead; idiot; dimwit (uk)
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) | ぼんくらな | (bonkurana) |
| Non-past, plain | ぼんくらだ | (bonkurada) |
| Non-past, polite | ぼんくらです | (bonkuradesu) |
| Past, plain | ぼんくらだった | (bonkuradatta) |
| Past, polite | ぼんくらでした | (bonkuradeshita) |
| Negative, plain | ぼんくらじゃない | (bonkurajanai) |
| Negative, polite | ぼんくらじゃないです | (bonkurajanaidesu) |
| Past negative, plain | ぼんくらじゃなかった | (bonkurajanakatta) |
| Past negative, polite | ぼんくらじゃなかったです | (bonkurajanakattadesu) |
| Te-form | ぼんくらで | (bonkurade) |
| Conditional (―nara) | ぼんくらなら | (bonkuranara) |