dull >> /dəl/
Definition: [verb] Make or become dull or less intense.
Example: time dulls the memory
Definition: [adjective] Lacking interest or excitement.
Example: your diet doesn't have to be dull and boring
Definition: [adjective] Lacking brightness, vividness, or sheen.
Example: his face glowed in the dull lamplight
Definition: [adjective] (of a person) slow to understand; stupid.
Example: the voice of a teacher talking to a rather dull child