IPA: /ˈɛnvaɪər/
KK: /ɛnˈvaɪər/
A person who feels jealousy or resentment towards someone else's possessions or qualities.
She was an envier, always wishing she had what her friends had.
Envier is derived from Old French 'enviier', which comes from the Latin 'invidere' (meaning to look at with envy or to be jealous). The word combines 'in-' (meaning upon) and 'videre' (meaning to see). Thus, 'envier' refers to the act of looking upon someone else's possessions or success with jealousy.
Think of 'looking upon' ('videre') something 'with envy' ('in-') — that's why envier means to feel jealousy towards someone else's good fortune.