açı

/atʃɯ/

As an adjective

Degrees

base formaçıbitter
comparative — moreaçıraqbitterer
intensifier — verybek açıvery bitter
superlative — mostem açıthe bitterest

Saying it about something

One thingSeveral
this / thesebu açıdıthis is bitterbıla açıdılathese are bitter
that / thoseol açıdıthat / it is bitterala açıdılathose / they are bitter
minemeniki açıdımine is bittermenikile açıdılamine are bitter
yoursseniki açıdıyours is bittersenikile açıdılayours are bitter
oursbizniki açıdıours is bitterbiznikile açıdılaours are bitter

As a noun

Cases

FormWhen to use it
nominativeaçıthe bitternessthe plain dictionary form — the doer of the sentence
genitiveaçınıthe bitterness'the owner — whose it is
accusativeaçınıthe bitterness (as the object)a specific, known object — whom or what
dativeaçığato the bitternessdirection or recipient — to where, to whom
locativeaçıdaat / in the bitternesswhere it is; also having — mende bar, "I have it"
ablativeaçıdanfrom the bitternesswhere 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

Owned
myaçımmy bitterness
youraçıngyour bitterness
his / heraçısıhis / her bitterness
ouraçıbızour bitterness
you all'saçığızyou all's bitterness
theiraçılarıtheir bitterness

There is no plural of this word. The ending would attach like any other — it is the word, not the grammar, that refuses: this is not something Karachay counts.