rychlou

Rychlou is the instrumental feminine singular form of the Czech adjective rychlý, meaning fast or quick. It is used to modify a feminine noun in the instrumental case, and thus appears in constructions that describe the manner or means of an action.

In common usage, rychlou is found with feminine nouns in instrumental phrases. A representative example is the sentence: "jel rychlou jízdou," meaning "he rode with a fast ride" or more naturally "he went at high speed." This illustrates how the adjective and noun are declined to express the manner of the action.

Morphology and related forms: The base adjective is rychlý (masculine), with feminine nominative rychlá and neuter rychlé. The instrumental singular feminine form is rychlou. The corresponding adverb is rychle.

Notes: Rychlou itself is not a standalone noun; it is a grammatical form that appears only in agreement with a feminine noun in instrumental case. The form is common in prose and descriptive phrases but is rarely used outside grammatical or linguistic contexts.