ƕaþar

Part of speech: interrogative pronoun
which (of two)
Etymology
[← Prot-Germ *hwaþaraz, *hweþaraz; OE hwæþer, hwæðer (Mod E whether); O Fris hweder, hwedder; O Sax hwethar; OHG wedar; O Icel hvaðarr, hvárr (Mod Icel hvor) ← Indo-Europ *kwotero- “which”; Sanskr katará-; Avest katáro; Anc Gr πότερος; Lith katràs; O Slav котеръ, которъ (Russ который)]
Concordance
ƕaþar - Nom, Acc, sing, neut - Matth. IX, 5; Mrk. II, 9; Luk. V, 23; VII, 42; Philip. I, 22; Skeirns. III, 4
Paradigm

3.3. Interrogative pronouns

In Gothic, like in other German languages, inter pron-s are derived from the stem *xwa-, *xwō-, have masc (ƕas (who)), neut (ƕa (what)) and fem (ƕo (who)) gender and are used only in sing:

singular number
masculine neuter feminine
nominative ƕas ƕa ƕo
genitive ƕis ƕis ƕizos
dative ƕamma ƕamma ƕizai
accusative ƕana ƕa ƕo
instrumental - ƕe -

The form *ƕizos (fem, Gen) is not attested in the surviving Goth sources.
The inter pron ƕarjis (who; which) is also declined like strong adjectives.