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From The Collaborative International Dictionary of English v.0.48:
Weak \Weak\ (w[=e]k), a. [Compar. Weaker (w[=e]k"[~e]r); superl. Weakest.] [OE. weik, Icel. veikr; akin to Sw. vek, Dan. veg soft, flexible, pliant, AS. w[=a]c weak, soft, pliant, D. week, G. weich, OHG. weih; all from the verb seen in Icel. v[imac]kja to turn, veer, recede, AS. w[imac]can to yield, give way, G. weichen, OHG. w[imac]hhan, akin to Skr. vij, and probably to E. week, L. vicis a change, turn, Gr. e'i`kein to yield, give way. [root]132. Cf. Week, Wink, v. i. Vicissitude.] [1913 Webster] 1. Wanting physical strength. Specifically: [1913 Webster] (a) Deficient in strength of body; feeble; infirm; sickly; debilitated; enfeebled; exhausted. [1913 Webster] A poor, infirm, weak, and despised old man. --Shak. [1913 Webster] Weak with hunger, mad with love. --Dryden. [1913 Webster] (b) Not able to sustain a great weight, pressure, or strain; as, a weak timber; a weak rope. [1913 Webster] (c) Not firmly united or adhesive; easily broken or separated into pieces; not compact; as, a weak ship. [1913 Webster] (d) Not stiff; pliant; frail; soft; as, the weak stalk of a plant. [1913 Webster] (e) Not able to resist external force or onset; easily subdued or overcome; as, a weak barrier; as, a weak fortress. [1913 Webster] (f) Lacking force of utterance or sound; not sonorous; low; small; feeble; faint. [1913 Webster] A voice not soft, weak, piping, and womanish. --Ascham. [1913 Webster] (g) Not thoroughly or abundantly impregnated with the usual or required ingredients, or with stimulating and nourishing substances; of less than the usual strength; as, weak tea, broth, or liquor; a weak decoction or solution; a weak dose of medicine. [1913 Webster] (h) Lacking ability for an appropriate function or office; as, weak eyes; a weak stomach; a weak magistrate; a weak regiment, or army. [1913 Webster] 2. Not possessing or manifesting intellectual, logical, moral, or political strength, vigor, etc. Specifically: [1913 Webster] (a) Feeble of mind; wanting discernment; lacking vigor; spiritless; as, a weak king or magistrate. [1913 Webster] To think every thing disputable is a proof of a weak mind and captious temper. --Beattie. [1913 Webster] Origen was never weak enough to imagine that there were two Gods. --Waterland. [1913 Webster] (b) Resulting from, or indicating, lack of judgment, discernment, or firmness; unwise; hence, foolish. [1913 Webster] If evil thence ensue, She first his weak indulgence will accuse. --Milton. [1913 Webster] (c) Not having full confidence or conviction; not decided or confirmed; vacillating; wavering. [1913 Webster] Him that is weak in the faith receive ye, but not to doubtful disputations. --Rom. xiv. 1. [1913 Webster] (d) Not able to withstand temptation, urgency, persuasion, etc.; easily impressed, moved, or overcome; accessible; vulnerable; as, weak resolutions; weak virtue. [1913 Webster] Guard thy heart On this weak side, where most our nature fails. --Addison. [1913 Webster] (e) Wanting in power to influence or bind; as, weak ties; a weak sense of honor of duty. [1913 Webster] (f) Not having power to convince; not supported by force of reason or truth; unsustained; as, a weak argument or case. "Convinced of his weak arguing." --Milton. [1913 Webster] A case so weak . . . hath much persisted in. --Hooker. [1913 Webster] (g) Wanting in point or vigor of expression; as, a weak sentence; a weak style. [1913 Webster] (h) Not prevalent or effective, or not felt to be prevalent; not potent; feeble. "Weak prayers." --Shak. [1913 Webster] (i) Lacking in elements of political strength; not wielding or having authority or energy; deficient in the resources that are essential to a ruler or nation; as, a weak monarch; a weak government or state. [1913 Webster] I must make fair weather yet awhile, Till Henry be more weak, and I more strong. --Shak. [1913 Webster] (k) (Stock Exchange) Tending towards lower prices; as, a weak market. [1913 Webster] 3. (Gram.) (a) Pertaining to, or designating, a verb which forms its preterit (imperfect) and past participle by adding to the present the suffix -ed, -d, or the variant form -t; as in the verbs abash, abashed; abate, abated; deny, denied; feel, felt. See Strong, 19 (a) . (b) Pertaining to, or designating, a noun in Anglo-Saxon, etc., the stem of which ends in -n. See Strong, 19 (b) . [1913 Webster] 4. (Stock Exchange) Tending toward a lower price or lower prices; as, wheat is weak; a weak market. [Webster 1913 Suppl.] 5. (Card Playing) Lacking in good cards; deficient as to number or strength; as, a hand weak in trumps. [Webster 1913 Suppl.] 6. (Photog.) Lacking contrast; as, a weak negative. [Webster 1913 Suppl.] Note: Weak is often used in the formation of self-explaining compounds; as, weak-eyed, weak-handed, weak-hearted, weak-minded, weak-spirited, and the like. [1913 Webster] [1913 Webster] Weak conjugation (Gram.), the conjugation of weak verbs; -- called also new conjugation, or regular conjugation, and distinguished from the old conjugation, or irregular conjugation. Weak declension (Anglo-Saxon Gram.), the declension of weak nouns; also, one of the declensions of adjectives. Weak side, the side or aspect of a person's character or disposition by which he is most easily affected or influenced; weakness; infirmity. weak sore or weak ulcer (Med.), a sore covered with pale, flabby, sluggish granulations. [1913 Webster]