Taru adjective, Adverb taking the 'to' particle
vast (ocean, desert, etc.); boundless; extensive
Usually written using kana alone
その島の飛行場は、今では草がぼうぼうだ。The airfield on the island is now covered with weeds. vague (e.g. memories); unclear; fuzzy; hazy
Usually written using kana alone
rampant (weeds, etc.); running wild; overgrown
Usually written using kana alone
unkempt (hair, beard, etc.); shaggy; scraggly
Usually written using kana alone
Also written 茫茫【ぼうぼう】