Dull, Dulled, Edgeless, Insensitive, Obtuse
as blithe as May
Animated, Buoyant, Carefree, Cheerful
as blank as an empty bottle
Bare, Barren, Clean, Empty
as blameless as the snow
Above suspicion, Clean, Clean-handed, Clear
as black as ebony
Dark, Inky, Atramentous, Brunet, Charcoal
as bitter as gall
Absinthal, Absinthian, Acerb, Acerbic, Acid
as bitter as warmwood
Absinthal, Absinthian, Acerb, Acerbic, Acid
as bitter as hemlock
Absinthal, Absinthian, Acerb, Acerbic, Acid
as beautiful as the rainbow
Admirable, Alluring, Angelic, Appealing
as bashful as a schoolgirl
Abashed, Backward, Blushful, Blushing
as barren as winter rain
Arid, Depleted, Desert, Desolate, Dry
as awkward as a cow on ice
All Thumbs, Amateurish, Artless, Blundering
as awful as justice
Abominable, Alarming, Appalling, Atrocious
as audacious as the day
Adventurous, Aweless, Bold, Brassy, Brave
as artificial as made ice
Bogus, Counterfeit, Ersatz, Fabricated, Factitious