"passionless" in the adjective sense
1. passionless
not passionate
"passionless observation of human nature"
2. emotionless, passionless
unmoved by feeling
"he kept his emotionless objectivity and faith in the cause he served"
"this passionless girl was like an icicle in the sunshine"-Margaret Deland
Source: WordNet® (An amazing lexical database of English)
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