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

2 senses of impede

Sense 1
impede, hinder -- (be a hindrance or obstacle to; "She is impeding the progress of our project")
       => prevent, keep -- (stop (someone or something) from doing something or being in a certain state; "We must prevent the cancer from spreading"; "His snoring kept me from falling asleep"; "Keep the child from eating the marbles")

Sense 2
obstruct, obturate, impede, occlude, jam, block, close up -- (block passage through; "obstruct the path")
       => impede, hinder -- (be a hindrance or obstacle to; "She is impeding the progress of our project")

Antonyms of adj impeding

1 sense of impeding

Sense 1
clogging, hindering, impeding, obstructive -- (preventing movement; "the clogging crowds of revelers overflowing into the street")

INDIRECT (VIA preventive) -> permissive -- (not preventive)

Similarity of adj impeding

1 sense of impeding

Sense 1
clogging, hindering, impeding, obstructive -- (preventing movement; "the clogging crowds of revelers overflowing into the street")
       => preventive (vs. permissive), preventative -- (tending to prevent or hinder)