The word "chi-chi" can be described as something or someone who is flashy or stylish in an extravagant and often excessive way. Some antonyms for chi-chi might include words such as simple, plain, unadorned, or understated. These words describe a style or appearance that is modest, unpretentious, and perhaps even minimalistic or austere. Another antonym for chi-chi might be humble, which implies a lack of arrogance or excessive pride, and a willingness to avoid excessive attention or showiness. Ultimately, antonyms for chi-chi describe a style or attitude that is the opposite of flashy or extravagant, emphasizing simplicity, practicality, and humility above all else.