na

no, un-, nope, nay

from Avestan na "not, no".

Proto-Indo-European root meaning "not",
Sanskrit a-, an- "not",
Greek a-, an-, ne- "not",
Proto-Germanic *ne,
Old Norse, Old Frisian, Old High German ne,
Gothic ni "not",
Latin in- "not" ne "that not",
Old Church Slavonic and Lithuanian ne "not",
Old Irish an-, ni,
Cornish ny "not",
Gothic and Old English un- "not",
English no, none,
German nein.