Apprehensive

боязли́вый

bojazlívyj

(anticipating something with anxiety or fear)

встрево́женный

vstrevóžennyj

(anticipating something with anxiety or fear)

насторо́женный

nastoróžennyj

(anticipating something with anxiety or fear)

опаса́ющийся

opasájuščijsja

(anticipating something with anxiety or fear)

поня́тливый

ponjátlivyj

(perceptive; quick to learn; intelligent; capable of grasping with the mind or intellect)

проница́тельный

pronicátelʹnyj

(perceptive; quick to learn; intelligent; capable of grasping with the mind or intellect)

смышлёный

smyšljónyj

(perceptive; quick to learn; intelligent; capable of grasping with the mind or intellect)

сообрази́тельный

soobrazítelʹnyj

(perceptive; quick to learn; intelligent; capable of grasping with the mind or intellect)