The word imbecilic is an adjective.

intestines and imbecilic cord

It means you are stupid, dumb, idiotic, brainless, unintelligent, or imbecilic.

'Unhampered' is a normal adjective, so you'd use it like any other. 'Dorothy was unhampered by the dog in her basket, the imbecilic scarecrow, arthritic, heartless tin man and cowardly lion.'

A synonym for idiotic could be half-witted, stupid, or fatuous.

Other synonyms include:

crackbrained

insane

absurd,

cockeyed,

derisory,

idiotic,

laughable,

ludicrous,

nonsensical,

preposterous,

ridiculous

foolish

imbecile,

imbecilic