hard like a rock

(rock) + (all over again) Same-ON
★☆☆☆☆
12 strokes
DUPE
this is the least used of the 3 かたい dupes.

Onyomi

KOU, KU

Mnemonic

Thanks to viagra, the old man's junk got rock hard all over again, and furthermore his COLON too.

Kunyomi

かた*い hardーalmost the same as the OTHER かたい (固)- hard like hard to break. If you want to say someone is stiff or stubborn or anal retentive, you'd have to use 固い, though.
★★☆☆☆

Jukugo

硬直した(こうちょくした)

rigid ★☆☆☆☆
(hard like a rock) + (correct a probem / direct contact) = 硬直した (rigid)

rigid - but not like a boner. Like a rigid class system resistant to change. Like rigor mortis. Other meaning: to sit bolt upright, soldiers rigidly standing at attention.

Lookalikes

Meaning Hint Radical
hard like a rock ROCK
使 use BERET
便 convenient / poop RICE FIELD

"Hard" as a ROCK.

A person uses a BERET to keep his head warm,

but another person takes a poo in the RICE FIELD.

You're welcome.

Synonyms

currency
硬貨    小銭    通貨   
hard
固    硬    堅   
stiffen
硬くなる    固める    硬直する    硬化