Definition from Wiktionary, the free dictionary
From Middle English weike, from Old Norse veikr (“weak”), cognate with Old English wīcan (“to yield”). Proto-Indo-European base *weik- (“to bend, wind”). Replaced the native Old English wāc. Compare German weich, Dutch week.
- Lacking in force (usually strength) or ability.
- The child was too weak to move the boulder.
- They easily guessed his weak computer password.
- Dilute, lacking in taste or potency.
- We were served stale bread and weak tea.
- (grammar) Displaying a particular kind of inflection, including:
- (physics) One of the four fundamental forces associated with nuclear decay.
- (slang) Bad or uncool.
- This place is weak.
- (mathematics, logic) Having a narrow range of logical consequences; narrowly applicable. (Often contrasted with a strong statement which implies it.)
- (lacking in force or ability): feeble, frail, powerless
- (lacking in taste or potency): dilute, watery
- (lacking in force or ability): healthy, powerful, robust, strong
- (lacking in taste or potency): potent, robust, strong
Derived terms 
lacking in force or ability
dilute, lacking in taste or potency
grammar: regular in inflection
physics: one of the four fundamental forces associated with nuclear decay
slang: bad or uncool
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Translations to be checked
West Frisian