Lah-di-dah is often used to describe someone who is pretentiously snobbish or dismissive. There are several synonyms that convey a similar meaning, including high-handed, condescending, supercilious, haughty, and patronizing. Each of these terms suggests an air of arrogance and superiority, as if the person is looking down their nose at others. Other synonyms for lah-di-dah might include pompous, ostentatious, affected, or vain. These words all imply a sense of showiness or artificiality, as if the person is trying too hard to impress others with their supposed sophistication and refinement. Ultimately, the choice of synonym will depend on the context and tone of the sentence in which it is used.