This is the 3769th most frequent Russian word.
четкий
Clear, precise, or cool (slang).
Here, 'четкий' is used to mean 'clear' or 'well-defined,' indicating that the plan is easy to understand and logically structured.
У него четкий план действий на случай непредвиденных ситуаций.
He has a clear action plan for unforeseen situations.
In this sentence, 'четкий' describes handwriting as legible and precise, emphasizing clarity in written expression.
Её почерк настолько четкий, что его можно читать как печатный текст.
Her handwriting is so clear that it can be read like printed text.
Here, 'четкий' is used to describe a screen as 'sharp,' referring to its clarity and high-quality resolution.