観かん念ねん主しゅ義ぎ

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Meanings

1

noun

German idealism

A philosophical term referring to the tradition of German idealism, particularly the works of Kant, Fichte, Schelling, and Hegel.

観outlook, look, appearance

念wish, sense, idea

主lord, chief, master

義righteousness, justice, morality

唯ゆい心しん論ろん
唯心論 is a broader term for idealism in philosophy, while 観念主義 specifically refers to the German idealist tradition.
唯ゆい物ぶつ論ろん
唯物論 (materialism) is the philosophical opposite of idealism, emphasizing matter over mind.

Compound of 観念 (idea, notion) and 主義 (principle, -ism), likely a Meiji-era calque from German 'Idealismus' or English 'idealism'.