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Grammar detail: かろう

かろう  formal plain volitional
132 words
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The かろう form is a formal and somewhat old-fashioned volitional form for い adjectives. In this form, the い is replaced with かろう.
はや
かろう
ゆっくりであろう
ちゅうい
注意
して
うんてん
運転
しなさい

Whether you drive fast or slow, drive carefully.
It is often seen with the negative form of a verb, since the negative plain form conjugates like an い adjective - for example, where である becomes であろう, ではない becomes ではなかろう.
わたし
やりたかろうそうでなかろう
かんけい
関係
ない

It makes no difference whether you want to do it or not.
This form is commonly seen as part of some form of the expression あろうか ... なかろうか, to express the idea 'whether (this) or (that)' etc:
であろうなかろう
べんきょう
勉強
こんき
根気
よく
つづ
けなければ
だめ
Whether you like it or not, you must stick to your work.

Not to be confused with ...

Note that かろう is also the normal (positive) volitional ending for verbs such as 掛かる - so it is possible to see 〜かろう without it being the negative volitional:
さあ
しごと
仕事
かろ

Let's get down to work.
かろう also appears as part of the common word かろうじて, meaning 'just barely':
かろうじて
くるま
てられず
すんだ
I narrowly escaped being hit by a car.
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Kanji used in this grammar

hanging   かかる to be hanging, to cost, to take   かける to hang up, to spend, to multiply   -がかり person in charge   
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ソク   はや fast   はやまる be hasty   はやめる to expedite, to hasten   すみやか speedy   
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チュウ   そそ to pour   
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イ    idea   
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ウン   carry; luck   はこ to carry   
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テン   ころがる to roll (intr.)   ころがす to roll (tr.)   ころげる to roll about   ころ to fall over   
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シ   わたくし    わたし I, myself   
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カン   せき barrier   かかわる to be connected   
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ケイ   in charge   かかり charge, duty   かか to relate to   
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コウ   この    す to like   
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ベン    exertion   
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キョウ   ゴウ   つよ strong   つよまる to get stronger   つよめる to strengthen   しいる to compel, to force   
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コン   ね root   
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キ   ケ    spirit   
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ゾク   つづ to continue   つづける to carry on with   
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シ   ジ   つかえる to attend to   
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ジ   ズ   こと thing; matter   
シュ   と to take   
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シャ   くるま car   
トウ   あてる    あたる to hit   
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