English clandestine

← French clandestin (cognate)

← Proto-Indo-European *ḱel- (cover) (root)

← Latin clandestīnus (borrowed)

→ English clandestinely (suffix)

→ English clandestineness (suffix)

→ English clandestinity (suffix)

→ English nonclandestine (prefix)

→ Spanish clandestino (cognate)

→ Polish cynk (link)