doubtful

词形变化：

副词: doubtfully | 名词: doubt-fulness |

词义辨析：

同义:

a.怀疑的

uncertain

irresolute

vacillating

indecisive

distrustful

suspicious

incredulous

disbelieving

unsure

questioning

skeptical

wavering

a.疑虑的

questionable

debatable

disputable

dubious

problematic

precarious

incredible

unbelievable

unclear

同义参见:

alleged

cynical

controversial

fishy

conjectural

improbable

ambiguous

反义参见:

confident

clear

sure

evident

precise

certain