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.  — see 'no article' —
plur. indef. neg.  keine -en keine -en keinen -en keiner -en


Notes


  • 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.