adjective

• 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.
• (often with for) Having a strong, irrepressible emotional love for someone or (less often) something; sentimentally affected by such love.
• Dilute, lacking in taste or potency.
• (grammar) Displaying a particular kind of inflection, including:
• (Germanic languages, of verbs) Regular in inflection, lacking vowel changes and having a past tense with -d- or -t-.
• (Germanic languages, of nouns) Showing less distinct grammatical endings.
• (Germanic languages, of adjectives) Definite in meaning, often used with a definite article or similar word.
• (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.