Of a shifty, unreliable character; deceitful, insincere. Of disposition, conduct, actions, etc.

Changeable, changeful, inconstant, uncertain, unreliable. of persons, their attributes, feelings, etc.; also often, with personification, of…

Faithless; unreliable.

Changeable, unreliable, unsteady, wavering.

Untrustworthy, not to be trusted (to), unreliable. Of persons.

figurative. Of persons: Slippery, unreliable; apt to fall or transgress. Obsolete.

Of persons, etc.: Not to be trusted or relied upon; unreliable, untrustworthy.

Unreliable.

Unreliable.

Of persons: Inclined to be fickle or faithless; not to be depended on; shifty, deceitful.

untrustworthy.

(un-, prefix1 affix 1.)

= unresponsible, adj. (in various senses).

Unreliable, not to be trusted. Obsolete.

Dependable only when conditions or circumstances are favourable; unreliable in times of difficulty.

Originally: that cannot be relied on; unreliable. Later more usually: reckless, imprudent, irresponsible.

Not dependable; untrustworthy; not to be depended upon.

Not reliable; that cannot or should not be relied on.

(un-, prefix1 affix 1.)

Not to be depended upon; unreliable, untrustworthy.

Of a person or his disposition: That cannot be reckoned upon; such that his action cannot be estimated or forecast.

Slippery, in various senses.

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

Not to be relied on; spec. liable to pull out of a (sporting) event, esp. through injury.