blahest

adjective

superlative form of blah; most dull, uninteresting, or uninspiring

Usage: informal; superlative degree

Examples

That was the blahest movie I've ever seen.
The blahest part of the conference was the opening speech.
Her outfit was the blahest shade of gray.
Of all the restaurants we tried, that one had the blahest food.
The blahest weather we've had all year made everyone stay indoors.