Jisho

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Taru-adjective, No-adjective
1. thunderous; rumblingOnly applies to ごうごう
Adverb taking the 'to' particle
2. thunderously; rumblinglyUsually written using kana alone
Other forms
轟々 【とどろとどろ】轟轟 【ごうごう】轟轟 【とどろとどろ】ゴーゴーごーごー
Notes
とどろとどろ: Out-dated or obsolete kana usage. とどろとどろ: Out-dated or obsolete kana usage.

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