Klingon has no adjectives. Many of the ideas that are adjectives in English are actually verbs in Klingon:
tIn "be big"
Quch "be happy"
Qatlh "be difficult"
chIS "be white"
To use these verbs adjectivally, you place them after the noun they describe:
Duj tIn "a big ship"
tlhIngan Quch "a happy Klingon"
Qu' Qatlh "a difficult task"
raS chIS "a white table"
It is also possible to use a noun as an adjective, in which case it goes before the noun it is describing such as tlhIngan Duj "a Klingon ship".