頑丈 (ganjou) conjugation
solid, firm, strong
頑丈 (がんじょう, ganjou) is a na-adjective. Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 頑丈だ ganjouda | 頑丈です ganjoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 頑丈じゃない ganjoujanai | 頑丈じゃないです ganjoujanaidesu | “is not ~”. |
| Past | 頑丈だった ganjoudatta | 頑丈でした ganjoudeshita | “was ~”. |
| Past negative | 頑丈じゃなかった ganjoujanakatta | 頑丈じゃなかったです ganjoujanakattadesu | “was not ~”. |
| Te-form | 頑丈で ganjoude | — | Links to the next clause: “~ and …”. |
| Adverb | 頑丈に ganjouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 頑丈な〜 ganjouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 頑丈なら ganjounara | — | “if it is ~”. |
| Conditional (~たら) | 頑丈だったら ganjoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 頑丈になる ganjouninaru | 頑丈になります ganjouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 頑丈すぎる ganjousugiru | 頑丈すぎます ganjousugimasu | “too ~”. |
| Looks ~ (~そう) | 頑丈そう ganjousou | 頑丈そうです ganjousoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
See the full rules in the adjective conjugation guide.