unstriped

The muscles of the limbs are made up of striped muscle-cells; those of the stomach, etc., of unstriped cells.
Voice Production in Singing and Speaking|Wesley Mills
Now, can you tell me whether each spine has likewise an oblique unstriped or striped muscle, as figured by Lister?
More Letters of Charles Darwin Volume II|Charles Darwin
They cause this to contract, whether it be striped and voluntary, or of the involuntary unstriped kind.
The Action of Medicines in the System|Frederick William Headland
Also, so far as I know, the distribution of unstriped muscle in Ammocœtes has not been worked out.
The Origin of Vertebrates|Walter Holbrook Gaskell

Epithelial, muscle—in particular the unstriped variety—and ganglion-cells may also become calcified.
A System of Practical Medicine by American Authors, Vol. I|Various

British Dictionary definitions for unstriped

unstriped

/ (ʌnˈstraɪpt) /

adjective

(esp of smooth muscle) not having stripes; unstriated

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012