Definition of "showerless"
Without a shower (bathroom fitting).
Quotations
We avoided Tourist Homes, country cousins of Funeral ones, old-fashioned, genteel and showerless, with elaborate dressing tables in depressingly white-and-pink little bedrooms, and photographs of the landlady’s children in all their instars.
1955, Vladimir Nabokov, Lolita, 1st American edition, New York, N.Y.: G[eorge] P[almer] Putnam’s Sons, published August 1958, part 2, page 148