Lacking in force (usually strength) or ability. Unable to sustain a great weight, pressure, or strain. Unable to withstand temptation, urgency, persuasion, etc.; easily impressed, moved, or overcome; accessible; vulnerable. Dilute, lacking in taste or potency. (grammar) Displaying a particular kind of inflection. (chemistry) That does not ionize completely into anions and cations in a solution. (physics) One of the four fundamental forces associated with nuclear decay. (slang) Bad or uncool. (mathematics, logic) Having a narrow range of logical consequences; narrowly applicable. (Often contrasted with a strong statement which implies it.) Resulting from, or indicating, lack of judgment, discernment, or firmness; unwise; hence, foolish. Not having power to convince; not supported by force of reason or truth; unsustained. Lacking in vigour or expression. Not prevalent or effective, or not felt to be prevalent; not potent; feeble. (stock exchange) Tending towards lower prices. (photography) Lacking contrast.