妄 (wàng) is a bound form (b.f.) that appears as a morpheme in compound words, carrying the core idea of 'reckless, absurd, or presumptuous behavior'. It does not stand alone as an independent word; you'll find it in words like 妄想 (wàngxiǎng, delusion), 妄图 (wàngtú, try in vain), 狂妄 (kuángwàng, arrogant), and 妄动 (wàngdòng, rash action). Understanding this root helps decode many formal or literary compounds.