Most commonly, love refers to a feeling of strong attraction and personal attachment.Ancient Greek philosophers identified four forms of love: essentially, familial love (in Greek, storge), friendly love (philia), romantic love (eros), and divine love (agape).Unrequited love refers to those feelings of love that are not reciprocated.
Although the nature or essence of love is a subject of frequent debate, different aspects of the word can be clarified by determining what isn't love (antonyms of "love").
Love as a general expression of positive sentiment (a stronger form of like) is commonly contrasted with hate (or neutral apathy); as a less sexual and more emotionally intimate form of romantic attachment, love is commonly contrasted with lust; and as an interpersonal relationship with romantic overtones, love is sometimes contrasted with friendship, although the word love is often applied to close friendships.
(Further possible ambiguities come with usages "girlfriend", "boyfriend", "just good friends").
Love has additional religious or spiritual meaning.
This diversity of uses and meanings combined with the complexity of the feelings involved makes love unusually difficult to consistently define, compared to other emotional states.