hadn't

• hadna, hadnae (nonstandard or dialectal)
• hant, hedn't (pronunciation spellings)

had +‎ -n't

• IPA^(key): /ˈhæd(ə)nt/

• Audio (US):

  (file)

hadn't

1. (informal) Contraction of had not (negative auxiliary^[1])

   Hadn't we better apologize? Surely we hadn't to be late.

“Hadn’t” (and “had not”) is mainly used as auxiliary, but can be also he used in place of “did not (or didn’t) have”, as in “I hadn’t a reason to do that.” instead of “I didn’t have a reason to do that.” The latter use is mostly limited to British English.