- effective
- efficacious
- efficient
Similar to efficax
- efficaciter – effectively, efficiently
- efficens – effective, efficient
- efficenter – effectively, efficiently, powerfully
- effigia – appartition, effigy, ghost, ideal, idol, likeness
- effigies – appartition, effigy, ghost, ideal, idol, likeness
- efficio – bring about, cause, effect, make, produce, prove, to bring to pass, to do
- inefficax – ineffectual, profitless, unproductive, weak