Structure
［い］Adjective［く］ + かろう
Details
About かろう
かろう is an old-fashioned grammar pattern that stems from the indeterminate form of the い-Adjective, かろ, and the addition of the auxiliary verb う. This transforms what would be seen in modern Japanese as いい + でしょう into よかろう.
The meaning itself is the same as だろう and でしょう in expressing agreement or volition, but tends to only be used in dramas or things like anime these days. To use this grammar pattern, simply replace the terminal い of the adjective with かろう.
The combination of ない and かろう is also fairly common, and will conjugate in the same way as above, as ない itself is an い-Adjective.
Even within drama and manga, this construction tends to only be used by elderly characters, or characters that have a high level of authority.
Examples
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ブランド物のあのバッグは高かろう。
That brand-bag is probably expensive.
老舗の団子屋さんの団子は美味しかろう。
The dango from that long-established dango shop are probably delicious.
家で一人で留守番をするのは寂しかろう。
Looking after a house by yourself is probably lonely.
このドレスは生地がペラペラだから安かろう。
Because the fabric of this dress is weak, it's probably cheap.
友達が多い人は、学校も毎日楽しかろう。
For people that have a lot of friends, even school is probably fun every day.
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