Category:Nominal Syntax
Feature:Adjectives without Nouns WALS
Name:Marked by mixed or other strategies
Languages (48):
Conlangs (45):
Old Adpihi
inapo-sakai
Raitoliste
Tine
Saimiar
Proto-Kunnu-lujungo 
There is no marking other than that the case suffix that would be on the noun moves to the adjective instead.
Ngaru
South Eresian
Standard Ancaron
Dhannuá
Athah
Kaynuryos
Omluuet
Pupupulandish
Başam
Inilt
Prydonian High Gallifreyan
G70200
Femmish
Bơlơn
Kiitra
Ixe Wa
Keihansoukaishi
Tumbian
Lohsee
Achiyitqan
Traup
Derovian
Thuun
Omnizzabon
Thulean
Firen
Kachan
Chlouvanem
Centaurian
Nicho
Eiidana
Zutian
Agalatian
Waa
Oltic
Standard Average Indo-European
Dundulanyä
Inga
Vonurustrusty 
Adjectives are always marked for gender. When there is no noun present, the adjective is marked based on the noun it's meant to describe, even if no one would use the noun in that case.

Natlangs (3):
Japanese
Chukchi
Epena Pedee