intelligent

/intelliɡent/

Cases

SingularPluralWhen to use it
nominativeintelligentthe member of the intelligentsiaintelligentlethe member of the intelligentsiasthe plain dictionary form — the doer of the sentence
genitiveintelligentnithe member of the intelligentsia'sintelligentlenithe member of the intelligentsias'the owner — whose it is
accusativeintelligentnithe member of the intelligentsia (as the object)intelligentlenithe member of the intelligentsias (as the object)a specific, known object — whom or what
dativeintelligentgeto the member of the intelligentsiaintelligentlegeto the member of the intelligentsiasdirection or recipient — to where, to whom
locativeintelligentdeat / in the member of the intelligentsiaintelligentledeat / in the member of the intelligentsiaswhere it is; also having — mende bar, "I have it"
ablativeintelligentdenfrom the member of the intelligentsiaintelligentledenfrom the member of the intelligentsiaswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
myintelligentimmy member of the intelligentsiaintelligentlerimmy member of the intelligentsias
yourintelligentingyour member of the intelligentsiaintelligentleringyour member of the intelligentsias
his / herintelligentihis / her member of the intelligentsiaintelligentlerihis / her member of the intelligentsias
ourintelligentibizour member of the intelligentsiaintelligentleribizour member of the intelligentsias
you all'sintelligentigizyou all's member of the intelligentsiaintelligentlerigizyou all's member of the intelligentsias
theirintelligentleritheir member of the intelligentsiaintelligentleritheir member of the intelligentsias

The overlap in the last rows is real, not a mistake: intelligentleri can mean "his / her member of the intelligentsias", "their member of the intelligentsia", or "their member of the intelligentsias" — context decides.