Lacking force of intellect or strength of mind; easily deceived, credulous.

Of a person. Originally: †naive, innocent, gullible (obsolete). Later: honest, straightforward, guileless; cf. simple-hearted, adj. (b). Now rare.

Of the nature of a gull; foolish, simple.

colloquial. Lacking intelligence or common sense; easily imposed on or deceived; foolish, silly. Also: mentally ill; having learning…

That may be cheated, liable to be cheated.

Liable to be led astray.

Of a person: gullible; easy to cheat or dupe. Cf. bubble, v. 5.

Capable of being imposed upon or cheated; gullible, dupable.

Easily made a ‘cull’ or fool of; gullible.

= gullible, adj.

capable of being humbugged, gullible.

Capable of being gulled or duped; easily cheated, befooled. Also absol.

Capable of being duped; gullible. Also as n.

easily cheated, gullible.

That may be fleeced, liable to be fleeced, cheatable.

capable of being imposed upon or influenced by bluffing.

capable of being hoodwinked.

Australian and New Zealand. Naive, gullible; foolish; unsophisticated; resembling a yob (yob, n. 2). Now rare.

Foolish, stupid, incompetent; easily duped or defeated. Frequently in mug punter (see punter, n.1 1b).