Adjective
existing as an idea but not having a physical or concrete existence
The concept of chance, that there could be events which are neither inevitable nor intentional, is difficult and abstract but it has gained strength as science has developed.
Adjective
concerned with the appreciation of beauty
"I hate that aesthetic game of the eye and the mind, played by these connoisseurs, these mandarins who 'appreciate' beauty. What is beauty, anyway? ...I love or I hate."
Adjective
showing smug or uncritical satisfaction with one's achievements
"Britain must not be complacent," Equalities Minister Lynne Featherstone said. "We are a world leader for gay rights but there is still more we must do."
The director of the U.S. Centers for Disease Control and Prevention says the film Contagion was designed for entertainment purposes, but that the scenario of a global pandemic is plausible.
Adjective
not revealing one's thoughts or feelings readily
People who are emotionally expressive should feel comfortable doing that and people who are naturally reticent should not feel like failures because they're not yucking it up all the time.