figurative. Weak, feeble. Obsolete.

Liable to fail or falter; weak, frail; uncertain, precarious.

Changeable, unreliable, unsteady, wavering.

Of a state of affairs or period of time: unsettled, troubled; characterized by discord or a lack of harmony. Cf. sense 3b. Obsolete.

Of evidence, argument, etc.: Not convincing. Of a case, title, etc.: Not having strong evidence.

transferred. Of arguments, titles, etc.: Weak, invalid; unsound. Now rare.

Having a slight foundation, ground, or justification.

figurative. Impaired, damaged, unsound; ruined in estate, bankrupt; of cracked reputation. Obsolete.

figurative. (Cf. unsinew, v. 1b.)

Unstable, unsteady, unsettled, uncertain, fickle.

Difficult or tricky to deal with; requiring careful or cautious handling; precarious, risky; ticklish. Cf. sense 2b.

adj. Unsound, infirm, ‘shaky’. Obsolete.

= flickering, adj. 3.

In immaterial sense. Of a person's position, credit, securities, etc.: Insecure, liable to fail or be upset, unreliable.

U.S. Rickety, ramshackle.

Of a person: shaky, groggy; unstable. Of a thing: faulty, unsound; unreliable.