I was married to a dismissive/avoidant personality whose emotional unavailability panned out as follows:
Lack of empathy. Wouldn't understand why things annoyed or upset me. Wouldn't stand up for me or have my back so that I was left to deal with family issues on my own.
Didn't like to be in the house or my company for any length of time. Up and out at the crack of dawn, always looking for excuses to disappear off but not interested in other people either.
Career and hobbies a priority which dominated majority of waking hours.
Never shared any thoughts or ideas with me. Was sullen and silent on days out. Could go to a dinner party and not utter a word all evening.
Would get up early and go to bed very late to avoid intimacy.
Never showed anger but it would leak out occasionally. Passive aggression to get his own back. Agree to things but not follow through, do what he wanted anyway.
Would clam up or disappear if you attempted to discuss or resolve issues.
Would expect your full support but gave none in return.
Never discussed or showed feelings. Emotionally cold and distant.
If you are considering an on going relationship with someone with these traits, run for the hills. Living with an emotional iceberg is miserable, lonely and soul destroying.