1 . not clear
who broke the glass yesterday is not clear ., 還不清楚昨天誰打破了玻璃.
2 . unclear
不清晰性 unintelligibility不清楚unclear不清楚發音 burr
3 . blear
bloom 開花blear 不清楚、模糊的[/loom]
4 . obscurity
obscure grays 暗線,模糊射線obscurity 模糊,不清楚observable (1)可觀察的(2)可觀察量(3)觀察算符.