What does 堅; 硬; 固い mean?
堅; 硬; 固い is a Japanese adjective meaning “solid, hard, firm” in English. It can also be translated as “stiff, strong, safe” depending on context. It is written as 堅; 硬; 固い in kanji, かたい in hiragana, and katai in romaji. This word is part of JLPT N4 vocabulary.
Example sentence
その機械の骨組みは堅くなければならない。
The frame of the machine should be rigid.