keep nose to the grindstone (verb) keep one's nose to the grindstone: work doggedly
Sinonime: earliest,
early,
first,
immaculate,
intact,
natural,
original,
primal, purified,
refined, sanitary, snowy, spotless, stainless,
sterile, sterilized, taintless, unadulterated, uncorrupted, undebased, unpolluted, unsoiled, unspotted, unstained, unsullied, untainted, untarnished,
untouched, virginal, wholesome