Barren, Bone-Dry, Desert, Dry as a Bone
as far apart as the poles
A Good Way, A Long Way, Afar, Bit, Deep
as angry as a wasp
Affronted, Annoyed, Antagonized, Bitter
as ancient as the sun
Age-Old, Aged, Antediluvian, Antiquated, Antique
as ambitious as the devil
Aggressive, Anxious, Ardent, Aspiring, Avid
as alone as a leper
Abandoned, Batching it, By itself/oneself
as alert as a chamois
Active, All ears, Bright, Cagey, Careful
as agile as a cat
Active, Acute, Alert, Athletic, Brisk
as ageless as the sun
Dateless, Eternal, Timeless
as afraid as grasshopper
Abashed, Aghast, Alarmed, Anxious
as active as quicksilver
Alive, Astir, At work, Bustling, eEfective
as black as ink
Dark, Inky, Atramentous, Brunet, Charcoal
as lonely as a cloud
Abandoned, Alone, Apart, By Oneself
limber as a dishrag
Agile, Deft, Elastic, Graceful, Lissome
thick as thieves
Blubbery, Broad, Burly, Chunky, Compact