Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb apprehend

3 senses of apprehend

Sense 1
grok, get the picture, comprehend, savvy, dig, grasp, compass, apprehend -- (get the meaning of something; "Do you comprehend the meaning of this letter?")
       => understand -- (know and comprehend the nature or meaning of; "She did not understand her husband"; "I understand what she means")

Sense 2
collar, nail, apprehend, arrest, pick up, nab, cop -- (take into custody; "the police nabbed the suspected criminals")
       => seize, prehend, clutch -- (take hold of; grab; "The sales clerk quickly seized the money on the counter"; "She clutched her purse"; "The mother seized her child by the arm"; "Birds of prey often seize small mammals")

Sense 3
apprehend, quail at -- (anticipate with dread or anxiety)
       => anticipate, look for, look to -- (be excited or anxious about)

Antonyms of adj apprehended

1 sense of apprehended

Sense 1
appreciated, apprehended, comprehended -- (fully understood or grasped; "dangers not yet appreciated"; "these apprehended truths"; "a thing comprehended is a thing known as fully as it can be known")

INDIRECT (VIA understood) -> ununderstood -- (not understood; "should not tamely submit to the unpredictable and ununderstood cycles of wars"- Psychiatry)

Similarity of adj apprehended

1 sense of apprehended

Sense 1
appreciated, apprehended, comprehended -- (fully understood or grasped; "dangers not yet appreciated"; "these apprehended truths"; "a thing comprehended is a thing known as fully as it can be known")
       => understood (vs. ununderstood) -- (fully apprehended as to purport or meaning or explanation; "the understood conditions of troop withdrawal were clear")