(product development) project

preliminary investigation / preparation for learning a lesson

project (planned endeavour)

tight / reliable

stable, fulfilled

be fast, securely in place / be reliable, level-headed / keep going, keep trying

new, novel / latest, recent / modern / fresh

fast (in a firm or secure manner), tightly / surely, unwaveringly, steadily, reliably

(archaic) new, novel / (archaic) latest, recent / (archaic) modern / (archaic) fresh

(obsolete) Alternative spelling of 新たし (aratashi): new, novel