conceited C2+

/kənˈsiːtɪd/ excessively proud of oneself; vain

conceitedness C2+

/kənˈsitɪdnəs/ excessive pride in oneself; vanity

inconceivable C2+

/ˌɪnkənˈsivəbəl/ impossible to imagine or believe

misconceive C2+

/ˌmɪskənˈsiv/ to understand or interpret wrongly