颖 is a bound form (b.f.) meaning 'intelligent' or 'clever', most commonly seen in the compound 聪颖 (cōngyǐng, 'intelligent'). It also appears in 新颖 (xīnyǐng, 'novel, original') where the meaning shifts to 'form, style' — so the two senses are tied to different compounds. As a bound form, it cannot stand alone as a word; you'll only encounter it as part of a two-character word.