lack

From Middle English lack, lakke, lak, from Old English *læc (“deficiency, lack, want”), from Proto-West Germanic *lak, from Proto-Germanic *laką, *lakaz (“slackness”), from Proto-Germanic *lakaz (“limp, slack, loose, low”), related to *lak(k)ōną (“to blame, reproach”), from Proto-Indo-European *lok-néh₂-. Cognate with Saterland Frisian Lak (“lack”), Middle Low German lack, lak (“lack”), Dutch lak (“lack, deficiency, calumny”), Icelandic lakur (“lacking”). Related also to Middle Dutch laken (“to blame, lack”).

Eclipsed non-native Middle English carence (“absence, lack”), from Old French carence.

Unrelated to Latin lacuna (“gap, void, want”), itself from Latin lacus (“lake, pond”), ultimately from Proto-Indo-European *lókus.

From Middle English lacken, lakken, laken, from Old English læccian, *lacian (“to blame, criticise, lack”), from Proto-West Germanic *lak(k)ōn (“to blame, be lacking”), from Proto-Germanic *lak(k)ōną (“to reproach, blame, be lacking”), from Proto-Indo-European *lok-néh₂-. Cognate with Old Frisian lakia, lekia (“to contest, blame”), Middle Low German lacken, laken (“to reproach, blame, criticise”), Middle Dutch laken (“to disapprove, blame, lack”), Dutch laken (“to blame, reproach”).