adverb
morally; from a moral standpoint
Adverbial use, often modifying verbs or whole clauses to indicate that an action or judgment is based on moral principles.
彼の行動は道徳上許されない。
His actions are morally unacceptable.
道徳上、それは正しいとは言えない。
Morally speaking, that cannot be called right.
noun which may take the genitive case particle 'no'
Adjectival use with の, modifying nouns to describe issues, responsibilities, or dilemmas that involve moral or ethical considerations.
これは道徳上の問題だ。
This is a moral issue.
医師には道徳上の責任がある。
Doctors have an ethical responsibility.
道徳的 is a na-adjective meaning 'moral' in a broader sense, whereas 道徳上 is more limited to the perspective or dimension of morality, often used with の or as an adverb.
Compound of 道徳 (どうとく, 'morality') and the suffix 上 (じょう, 'from the standpoint of'). The suffix 上 is productive and attaches to nouns to form adverbial or adjectival expressions indicating a particular aspect or perspective.