Crossword-Solution: UNDEMONSTRATIVE 15 letters, 56 clues 🏆 scrabble score: 21

He had the fault of thinking too well of himself--which who has not who thinks of himself at all, apart from his relation to the holy force of life, within yet beyond him? It was the almost unconscious, assuredly the undetected, self-approbation of the ordinarily righteous man, the defect of whose righteousness makes him regard himself as upright, but the virtue of whose uprightness will at length disclose to his astonished view how immeasurably short of rectitude he comes. A…

The first half of the 1960s was the apogee of what might be termed the Age of Cool - as defined by that quality of being simultaneously with-it and disengaged, in control but nonchalant, knowing but ironically self-aware, and above all inscrutably undemonstrative.