weak

adj

2.
overly diluted; thin and insipid
3.
(used of vowels or syllables) pronounced with little or no stress
4.
wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings
5.
tending downward in price
Derived from:
weakness
6.
deficient or lacking in some skill
7.
lacking bodily or muscular strength or vitality
Derived from:
weakness
8.
(used of verbs) having standard (or regular) inflection
9.
not having authority, political strength, or governing power
Derived from:
weakness
10.
deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc
11.
likely to fail under stress or pressure
Derived from:
weakness
12.
deficient in intelligence or mental power