Advantageous, All-purpose, Applied, Appropriate
as upright as a tower
Cocked, End on, End up, Erect, On end
as unusual as a sailor on horseback
Abnormal, Amazing, Astonishing, Atypical
as unsteady as the ocean
Capricious, Changeable, Dizzy, Erratic, Fickle
as unstable as the wind
Ambiguous, Borderline, Capricious, Changeable
as unreal as a dream
Aerial, Artificial, Chimerical, Delusive, Dreamlike
as unprofitable as smoke
Nonprofit, Profitless, Unlucrative, Unremunerative
as unmerciful as the billows
Bestial, Bloodthirsty, Brutal, Coldhearted, Hard
as universal as sea sickness
Accepted, All, All-Embracing, All-Inclusive
as unhappy as King Lear
Bleak, Bleeding, Bummed out, Cheerless
as unfeeling as rocks
Anesthetized, Apathetic, Asleep, Benumbed
as uncontrollable as the wave
Beside Oneself, Disorderly, Excited, Fractious
as unconquerable as chewing gum
Impregnable, Indefeasible, Indomitable
as uncompromising as justice
Decided, Determined, Dirm, Hard-Core
as uncomplaining as a lamb
Accommodating, Calm, Composed, Easy-Going