Hairless means having no hair. A hairless cat, hairless skin, completely hairless.
Of an animal it names a breed characteristic — the Sphynx cat and the Mexican hairless dog are both bred for it, and both need more care rather than less. Of a person it is clinical rather than descriptive. Note bald, which is the ordinary word for a human head; and that hairless describes a whole body where bald describes one part.
1adjectivehairlessHaving no hair.
“The newborn mice were pink, blind and completely hairless.”
hairless is a state of having no hair.
Hair plus -less. German haarlos is built identically, and hair comes from Old English haer, Germanic throughout.
Middle English
her
English
hair
English, today
hairless
From hair + -less. hair loss. Cognate with German haarlos. hair comes from Middle English her. From Middle English her, heer, hær, from Old English hǣr, from Proto-West Germanic hār, from Proto-Germanic hērą (“hair”), from Proto-Indo-European kes- (“to scrape, comb”). Cognate with stq Hier, Híer (“hair”), West Frisian hier (“hair”), cim haar, har (“hair”), Dutch haar (“hair”), German - and Low German Haar (“hair”), lb Hoer (“hair”), mhn hor (“hair”), Yiddish האָר (“hair”), Danish, Norwegian Bokmål, Norwegian Nynorsk and Swedish hår (“hair”), Faroese and Icelandic hár (“hair”). Eclipsed non-native Middle English cheveler, chevelere (“hair”), borrowed from Old French chevelëure (“hair, head-hair, coiffure, wig”).
Etymology from Wiktionary, CC BY-SA