Translation guide
The feeling of disappointment or loss of belief in something once idealized.
Expressing a feeling of disillusionment or loss of naive belief
The most direct equivalent, meaning disillusionment or disenchantment. Often used with する to mean 'become disillusioned'.
I became disillusioned with his irresponsible attitude.
I feel disenchantment at the gap between ideals and reality.
A more general term for disappointment, less formal than 幻滅. Can be used for disenchantment in everyday situations.
I was disenchanted with that movie.
Means 'to be disappointed', often with a sense of losing hope or trust. Slightly more formal than がっかり.
I was disenchanted by his actions.
Literally 'to wake from a dream', used metaphorically for disenchantment when one's illusions are shattered.
I became disenchanted after learning the reality.
Describing a world or situation that has lost its magic or charm
幻滅 (genmetsu) is specifically about disillusionment with something you once admired or believed in. がっかり (gakkari) is a casual, general disappointment. 失望 (shitsubou) implies a deeper loss of hope or trust, often in a person. Use 幻滅 when the focus is on shattered ideals.
That place has completely lost its charm for me.