Reverse Dictionary: ASSURE

ADJECTIVES
1200 ► SICKER fully assured or convinced; having confident or certain knowledge → Sc. & N. Eng. dial.
1340 ► SICKER assured, stable, certain; liable to be disturbed or unsettled → Sc. & N. Eng. dial.
1522 ► FAST AND SURE well assured, certain → obs.
1589 ► DEAD assured, absolute 
1721 ► GRATH assured, confident → Eng. dial., obs.
1808 ► MAKINT assured, confident, bold, brazen → Sc.
1950 ► WIRED → WIRED UP assured, certain and secure; totally under control → Amer. sl.

ADVERBS
1160 ► IWIS assuredly, certainly, indeed, truly → arch.
1220 ► SICKERLY assuredly, without doubt; undoubtedly, certainly, decidedly → obs. exc. Sc. & N. Eng. dial.
1300 ► WITHOUT NAY assuredly, certainly; beyond doubt or dispute → obs.
1425 ► WITHOUT DECEIT assuredly, certainly, without mistake → obs.
1816 ► ATWEEL assuredly, truly, indeed, of course → Sc. & Ireland
L19.. ► DAMN WELL assuredly, certainly, definitely, very much 
1903 ► MAKINTLY with assurance, ease, and confidence → Sc.

NOUNS
1100 ► SICKERNESS assurance; certainty; certain prospect or possession of something → obs.
1250 ► SICKERHEAD assurance, certainty → obs.
1300 ► FAY assurance; promise → obs. or arch.
1405 ► SICKERTY assurance; certainty; certain prospect or possession of something → obs.
1483 ► AFFIANCE assurance; confidence generally → obs.
1882 ► GALL brazen assurance; impudence, arrogance, self-possession → orig. US sl.
1893 ► INSURANCE assurance, great boldness, impudence → Amer. dial.
20C.. ► THE NOD unofficial assurance of a job, position, etc. → Aust. sl.
1908 ► ASSHORANCE assurance → Amer. dial.

PHRASES
1856 ► YOU’D YOU BETTER BELIEVE IT something is assured; you are absolutely right 

VERBS
1297 ► SICKER to assure a person of one’s good faith by a pledge or formal promise → rare or obs.
1297 ► SICKER to assure a person of safety → rare or obs.
1375 ► SICKER to assure one of a fact → rare or obs.
1637 ► CERTIORATE to assure; to certify; to inform authoritatively or positively 
1657 ► POLLICITATE to promise or assure → obs.
1864 ► WAT to assure; to know, to inform; to be sensible of → Sc.
1900 ► HAVE A FACE FOR OUGHT to have assurance or impudence enough for anything → Eng. dial. (Bk.)
1902 ► INSURE to assure, to pledge one’s word; to make sure; to guarantee → Eng. & Amer. dial. (Bk.)