(product development) project

tight / reliable

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

stable, fulfilled

preliminary investigation / preparation for learning a lesson

project (planned endeavour)

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

new, novel / latest, recent / modern / fresh

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

(obsolete) Same as あたらし (atarashi) above