Bending under pressure, weight, or force; pliant, or pliable; yielding; lacking stiffness or firmness: as, the weak stem of a plant.Lacking strength; not strong.Deficient in bodily strength, vigor, or robustness; feeble, either constitutionally or from age, disease, etc.; infirm; of the organs of the body, deficient in functional energy, activity, or the like: as, a weak stomach; weak eyes.Lacking moral strength or firmness; liable to waver or succumb when urged or tempted; deficient in steady principle or in force of character.Lacking mental power, ability, or balance; simple; silly; foolish.Unequal to a particular need or emergency; ineffectual or inefficacious; inadequate or unsatisfactory; incapable; impotent.Incapable of support; not to be sustained or maintained: unsupported by truth, reason, or justice: as, a weak claim, assertion, argument, etc.Deficient in force of utterance or sound; having little volume, loudness, or sonorousness; low; feeble; small.Not abundantly or sufficiently impregnated with the essential, required, or usual ingredients, or with stimulating or nourishing substances or properties; not of the usual strength: as, weak tea; weak broth; a weak infusion; weak punch.Deficient in pith, pregnancy, or point; lacking in vigor of expression: as, a weak sentence; a weak style.Resulting from or indicating lack of judgment, discernment, or firmness; arising from want of moral courage, of self-denial, or of determination; injudicious: as, a weak compliance; a weak surrender.Slight; inconsiderable; trifling.(I) In grammar, infiected— as a verb, by regular syllabic addition instead of by change of the radical vowel;as a noun or an adjective, with less full or original differences of case-and number-forms: opposed to strong (which see).Poorly supplied; deficient: as, a hand weak in trumps.Tending downward in price: as, a weak market; corn was weak.To make weak; weaken.To soften.To become weak.