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

2 senses of constrain

Sense 1
restrain, encumber, cumber, constrain -- (hold back)
       => restrict, restrain, trammel, limit, bound, confine, throttle -- (place limits on (extent or access); "restrict the use of this parking lot"; "limit the time you can spend with your friends")

Sense 2
stiffen, tighten, tighten up, constrain -- (restrict; "Tighten the rules"; "stiffen the regulations")
       => restrict, restrain, trammel, limit, bound, confine, throttle -- (place limits on (extent or access); "restrict the use of this parking lot"; "limit the time you can spend with your friends")

Antonyms of adj constrained

1 sense of constrained

Sense 1
constrained, forced, strained -- (lacking spontaneity; not natural; "a constrained smile"; "forced heartiness"; "a strained smile")

INDIRECT (VIA affected) -> unaffected -- (free of artificiality; sincere and genuine; "an unaffected grace")

Similarity of adj constrained

1 sense of constrained

Sense 1
constrained, forced, strained -- (lacking spontaneity; not natural; "a constrained smile"; "forced heartiness"; "a strained smile")
       => affected (vs. unaffected), unnatural -- (speaking or behaving in an artificial way to make an impression)