Answer:

sterile

Answer	Crossword Clue
STERILE	Lacking imagination
STERILE	Like a mule
STERILE	Germ-free

STERILE	Unproductive
STERILE	Aseptic
STERILE	Barren
STERILE	Clean and then some
STERILE	Like a mule, usually
STERILE	More than just clean
STERILE	Like most mules
STERILE	As clean as a doctor's instruments

STERILE	Lacking originality
STERILE	Fit to be used in an operating room
STERILE	Like an unopened Band-Aid
STERILE	Like operating rooms
STERILE	Unexciting
STERILE	Antiseptic
STERILE	Absolutely clean
STERILE	Arid

STERILE	Lacking vitality
STERILE	Fruitless
STERILE	Useless.
STERILE	Barren.
STERILE	Unfruitful.
STERILE	Barren of ideas.
STERILE	Ineffective.
STERILE	Free from germs.

STERILE	Lacking in interest.
STERILE	Aseptic.
STERILE	Fruitless.
STERILE	Unproductive.
STERILE	Not effective.
STERILE	Jejune.
STERILE	Unfruitful
STERILE	Like a surgeon's hands

STERILE	Useless; ineffective
STERILE	Without issue
STERILE	Ineffective
STERILE	"The ... Cuckoo," Pakula film
STERILE	Germfree