Desilusão
s.i.5 wɑ5ŋ s.i.5wɑ5ŋ dɪsɐpɔɪntmənt hjuːɐnfɔː miːfɔː ɡanθɹiː hjuːɐfɔːnmɪfɔː ɡaθɹiːn dɪsɪluːʒənmənt bʌt mɔː kənsɛptʃuːəl
In Chinese 失望 (shīwàng) - disappointment; 幻灭感 (huànmiè gǎn) - disillusionment (but more conceptual).
The feeling of disappointment resulting from the discovery that something is not as good as one had believed it to be.
Example
"Senti uma grande desilusão ao descobrir a verdade."