Restraining is a related term of costive.
As a verb restraining
As a noun restraining
is the act by which someone or something is restrained.
As an adjective costive is
The act by which someone or something is restrained.
* George Meredith
- She had the privilege of a soul beyond our minor rules and restrainings to speak her wishes to the true wife of a mock husband—no husband; less a husband than this shadow of a woman a wife, she said;
; constipated (figurative)
* 2005 , , Bloomsbury Publishing, paperback edition, page 346:
*: Melanie, who was used to Wani's costive memos, and even to dressing up the gist of a letter in her own words, stuck out her tongue in concentration as she took down Nick's old-fashioned periods and perplexing semicolons.