The word 'disillusioned' means to be disappointed or let down after discovering that something is not as wonderful as you thought it would be. The antonyms for disillusioned are 'hopeful' and 'optimistic', which mean to have a positive outlook or confident expectation of success. Another antonym for disillusioned is 'satisfied', which means to be content with what you have or have achieved. 'Fulfilled' is also an antonym which means to feel a sense of accomplishment or completion. By focusing on these antonyms, we can strive towards positivity, contentment, and fulfilment instead of feeling disappointed or let down.