Declension cheat sheet
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German loves™ its case syncretism, so finding the right declension can be a bitch if you don't happen to be a native speaker or somewhere on that level. Here's a table of the articles and their respective adjective agreement to serve as a cheat sheet. Yum, tables :3

With no article

= strong adjective declension

    NOM   ACC   DAT   GEN
masc. sing.   Ø -er   Ø -en   Ø -em   Ø -en
fem. sing.   Ø -e   Ø -e   Ø -er   Ø -er
neut. sing.   Ø -es   Ø -es   Ø -em   Ø -en
plur.   Ø -e   Ø -e   Ø -en   Ø -er

(Hint: Look at the forms of the definite article below …)

With definite article

= weak adjective declension

    NOM   ACC   DAT   GEN
masc. sing. def.   der -e   den -en   dem -en   des -en
fem. sing. def.   die -e   die -e   der -en   der -en
neut. sing. def.   das -e   das -e   dem -en   des -en
plur. def.   die -en   die -en   den -en   der -en

With indefinite article

= mixed adjective declension

    NOM   ACC   DAT   GEN
masc. sing. indef.   ein -er   einen -en   einem -en   eines -en
fem. sing. indef.   eine -e   eine -e   einer -en   einer -en
neut. sing. indef.   ein -es   ein -es   einem -en   eines -en
plur. indef.   Ø -e   Ø -e   Ø -en   Ø -er
plur. indef. neg.   keine -en   keine -en   keinen -en   keiner -en


  • Kein is the negative form of the indefinite article ein, used to negate noun phrases (from Middle High German dehein):

    Ich habe kein Auto 'I don't have a car'
     not: *Ich habe nicht ein Auto
     but: Ich habe nicht ein Auto 'I don't have one/a single car'.

    Ich habe keine Angst 'I'm not scared'
     not: *Ich habe nicht Angst
     not: *Ich habe nicht eine Angst (Angst 'fear' is uncountable in this context)
  • Also consider this list of noun inflection classes, which helps you to determine if there's a suffix going on your noun or not (or optionally, what with historical dative -e) and if so, which one.