What does 強固 mean?
強固 is a Japanese adjective meaning “firm; strong; solid; stable” in English. It is written as 強固 in kanji, きょうこ in hiragana, and kyouko in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
この実験で彼の学説はいっそう強固なものになった。
The experiment confirmed his theory.