definition of
weak

[1] #1 weak a. wanting in physical strength; "a weak pillar". wn

[2] #2 weak s. [watery, washy] overly diluted; thin and insipid; "washy coffee"; "watery milk"; "weak tea". wn

[3] #3 weak s. [unaccented, light] (used of vowels or syllables) pronounced with little or no stress; "a syllable that ends in a short vowel is a light syllable"; "a weak stress on the second syllable". wn

[4] #4 weak s. [fallible, frail, imperfect] wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings; "I'm only a fallible human"; "frail humanity". wn

[5] #5 weak s. tending downward in price; "a weak market for oil stocks". wn