This answer might come a bit late.. But arePerhaps you are looking for Blunted Affectblunted affect?
Wikipedia's definition goes like this:
"[It] is a clinical term to define a lack of emotional reactivityWikipedia's definition goes like this (affect displayarticle has been updated since) in an individual. It manifests as a failure to express feelings either verbally or non-verbally, especially when talking about issues that would normally be expected to engage the emotions...":
Blunted affect is a clinical term to define a lack of emotional reactivity (affect display) in an individual. It manifests as a failure to express feelings either verbally or non-verbally, especially when talking about issues that would normally be expected to engage the emotions.