Etymology 1 
From Middle English bleke (also bleche > English bleach (“pale, bleak”)), and bleike (due to Old Norse), and earlier Middle English blak, blac (“pale, wan”), from Old English blǣc, blǣċ, blāc (“bleak, pale, pallid, wan, livid; bright, shining, glittering, flashing”) and Old Norse bleikr (“pale, whitish”), from Proto-Germanic *blaikaz (“pale, shining”), from Proto-Indo-European *bʰlē-, *bʰel- (“to shine”). Cognate with Dutch bleek (“pale, wan, pallid”), Low German blek (“pale”), German bleich (“pale, wan, sallow”), Danish bleg (“pale”), Swedish blek (“pale, pallid”), Faroese bleikur (“pale”), Icelandic bleikur (“pale, pink”).
- Without color; pale; pallid.
- Desolate and exposed; swept by cold winds.
- Unhappy; cheerless; miserable.
- Downtown Albany felt bleak that February after the divorce.
- A bleak future is in store for you.
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Etymology 2 
Probably from Old Norse bleikja.
bleak (plural bleaks)