weak

adjective

• 1lacking the power to perform physically demanding tasks; lacking physical strength and energy:she was recovering from the flu and was very weak
• lacking political or social power or influence:the central government had grown too weak to impose order (as plural noun the weak)the new king used his powers to protect the weak
• (of a crew, team, or army) containing too few members or members of insufficient quality.
• (of a faculty or part of the body) not able to fulfill its functions properly:he had a weak stomach
• of a low standard; performing or performed badly:the choruses on this recording are weak
• not convincing or logically forceful:the argument is an extremely weak one a weak plot
• exerting only a small force:a weak magnetic field

• 2liable to break or give way under pressure; easily damaged:the salamander’s tail may be broken off at a weak spot near the base
• lacking the force of character to hold to one’s own decisions, beliefs, or principles; irresolute.
• (of a belief, emotion, or attitude) not held or felt with such conviction or intensity as to prevent its being abandoned or dispelled:their commitment to the project is weak
• not in a secure financial position:people have no faith in weak banks
• (of prices or a market) having a downward tendency.

• 3lacking intensity or brightness:a weak light from a single street lamp
• (of a liquid or solution) heavily diluted:a cup of weak coffee
• (of an acid) only slightly ionized.
• displaying or characterized by a lack of enthusiasm or energy:she managed a weak, nervous smile
• (of features) not striking or strongly marked:his beard covered a weak chin
• (of a syllable) unstressed.

• 4 Grammar denoting a class of verbs in Germanic languages that form the past tense and past participle by addition of a suffix (in English, typically -ed); contrasted with strong.

• 5 Physics of, relating to, or denoting the weakest of the known kinds of force between particles, which acts only at distances less than about 10^15 cm, is very much weaker than the electromagnetic and the strong interactions, and conserves neither strangeness, parity, nor isospin.