Learn Turkish: Taklit vazoların görünümü genellikle soluk ve grimsi olur. - The appearance of imitation vases is usually pale and grayish.

It uses the suffix -(I)msI, which adds the meaning of '-ish' or 'similar to' to adjectives and nouns. Here, it attaches to gri (gray). Because gri already ends in a vowel, it simply takes -msi to mean 'grayish'.

Why does this sentence end with olur instead of just using the 'to be' suffix like grimsidir?

Using the aorist form olur (from olmak, to be/become) expresses a general, timeless truth or a typical characteristic. While grimsidir is grammatically correct, olur is very common when describing how things typically turn out or naturally exist.

soluk can mean 'breath', but here it means 'pale'. Are they related?

They are actually from two different verb roots! The noun for 'breath' comes from solumak (to breathe). The adjective used here comes from solmak (to fade or wither). Adding the adjective-forming suffix -uk gives us soluk, meaning 'faded' or 'pale'.

In the phrase Taklit vazoların görünümü, why doesn't taklit take any suffixes?