Definitions
1.adjectiveNeither reflecting nor emitting light.
2.adjectiveAllowing little light to pass through, not translucent or transparent.
3.adjectiveUnclear, unintelligible, hard to get or explain the meaning of
4.adjectiveObtuse, stupid.
5.adjectiveDescribes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.