A term for a character or person who lacks any positive traits or characteristics that could make them likable or sympathetic. This concept is often used in discussions about fictional characters, personal self-perception, and relationships -- Brave AI.
overpromise, underdeliver
Overpromising and under-delivering is not redundant, as the promise and delivery are separate in time and context; one can overpromise and still overdeliver, though the latter is rare and often unsustainable -- Brave AI.
ambidexterity
Request: The right brain in right-handed people (the left brain in left-handed people) becomes dominant above consciousness level 200" - Truth vs. Falsehood (p. 93).
sportsmanship
Request: It seems like sportsmanship in general is virtuous and brings certain qualities with it. Like hard work, fairness, losing with kindness, sticking to rules, team spirit, celebration.
charm
Priority request. "A quality that makes you like or feel attracted to someone or something" -- cambridge.dictionary.org.
pettiness
Lack of generosity in trifling matters -- vocabulary.com.
automagically
"in a way that is automatic, without the need for human actions or control, and that seems to be magical" -- dictionary.cambridge.org.
well-being
"A measure of how well life is going for someone.... Often-discussed contributing factors include feelings, emotions, life satisfaction, achievement, finding meaning, interpersonal relationships, and health" -- wikipedia.
vitality
"a lively or energetic quality" -- merriam-webster.com
tranquility
An untroubled state that is free from disturbances -- vocabulary.com.
classy
Someone who puts a high standard on the way he behaves -- vocabulary.com.
magical thinking
"The belief that one’s ideas, thoughts, actions, words, or use of symbols can influence the course of events in the material world" -- britannica.
self-pity
Feeling sorry for yourself.
immature
Not behaving in a way that is as calm and wise as people expect from someone of your age -- Cambridge Dictionary.