weak

adjective

1. 1

   deficient in intelligence or mental power

   a weak mind

2. 2

   overly diluted; thin and insipid

   washy coffee

   watery milk

3. 3

   likely to fail under stress or pressure

   the weak link in the chain

4. 4

   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

5. 5

   deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc

   a faint outline

   the wan sun cast faint shadows

6. 6

   not having authority, political strength, or governing power

   a weak president

7. 7

   (used of verbs) having standard (or regular) inflection

8. 8

   lacking bodily or muscular strength or vitality

   a feeble old woman

   her body looked sapless

9. 9

   deficient or lacking in some skill

   he's weak in spelling

10. 10

    (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

11. 11

    wanting in physical strength

    a weak pillar

12. 12

    tending downward in price

    a weak market for oil stocks