The phrase "coarse at" is not correct and is not used in written English.
If you mean to say that something is difficult or lacking in finesse, you could use the word "coarse" or "crude", but they need to be used in a sentence. For example, "The crude paint job was done in a hurry."
We say the grid is "coarse" at the regional scale.
His poems are satiric, coarse, at times immoral, but fearless and outspoken in attacking the abuses of the age.
The adultery plays out in first-class airport lounges and ornate hotel rooms, and Rome reprises its traditional role as the city of dissolution, "rich and coarse at the same time, like a mixture of sackcloth and brocade".
But the motor still sounds coarse at the top end.
Researchers had long noticed that the pattern of HOX genes is coarse at first and gradually refined to single-cell resolution.
Then, the RRM based FTC-A* algorithm is designed to plan an FTC-route('fine-to-coarse' route) with being fine in vicinity yet coarse at a distance.
Energy systems are often considered at a coarse level – at the scale of a nation – or at a relatively fine scale – at the technology end.
However, FL microstructure becomes coarser at 1300 °C.
The beach sands in the studied region are in the range of fine to very coarse sands, with the finest sediments present at the high tide level and the coarsest at the low tide level (Grzelak et al., 2009).
The co-compost was softer and coarser at the end of co-composting process because the structure of shredded pineapple leaves was altered by cellulolytic and lignolytic microbes via breaking cellulose linkages present (Baharuddin et al. 2010).
In this more variable area, shallow aquifer sands are considerably coarser at NS6 than at NS7 (320±60 μm vs 180±40 μm) and the P-mobilizable As concentrations are correspondingly lower at NS6 than at NS7 (0.3±0.2 vs 0.7±0.4 mg/kg).
