Open English Wordnet
Nouns
(n)emotionlessness, impassivity, impassiveness, phlegm, indifference, stolidity, unemotionalityapathy demonstrated by an absence of emotional reactions
(n)apathy, indifference, numbness, spiritlessnessthe trait of lacking enthusiasm for or interest in things generally
(n)nonchalance, unconcern, indifferencethe trait of remaining calm and seeming not to care; a casual lack of concern