"Weakly" is a word in ENGLISH

weakly ENGLISH
Definition:

Not strong of constitution; infirm; feeble; as, a
weakly woman; a man of a weakly constitution.

weakly ENGLISH
Definition:

In a weak manner; with little strength or vigor; feebly.

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delicacy ENGLISH

Nicety or fineness of form, texture, or constitution; softness; elegance; smoothness; tenderness; and hence, frailty or weakness; as, the delicacy …

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infirm ENGLISH

Not firm or sound; weak; feeble; as, an infirm body; an infirm constitution.

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slender ENGLISH

Weak; feeble; not strong; slight; as, slender hope; a slender constitution.

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solid ENGLISH

Sound; not weakly; as, a solid constitution of body.

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A person of a weak or sickly constitution; one who is seeking to recover health.

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