Reverse Dictionary: ASSUME

ADJECTIVES
1559 ► AFFECTATE assumed unnaturally, forced, strain, stilted → obs.
1623 ► ADOPTIOUS assumed; adopted → obs.
20C.. ► BODGIE assumed; false; said of names, etc. → Aust. sl.
1905 ► ON-SETTEN assumed  → Eng. dial. (Bk.)

NOUNS
1572 ► SUMPTION an assumption, presumption; the taking of a thing as true without proof → obs.
1900 ► ONTACK assumption; airs and affectations → Sc.
1970 ► FACTOID a popular assumption or belief; a presumed fact of dubious validity → Amer. sl.

NOUNS, PERSON
1892 ► BIGGITY a man inclined to be assuming, independent, consequential, or who is giving himself airs → African-American usage (Bk.)

VERBS
1325 ► ON-TAKE to assume, to take on, to behave → obs.
1475 ► PRESUPPONE to presuppose; to assume beforehand → chiefly Sc., obs.
1500 ► PONDER to assume, to presume, to presuppose → obs.
1594 ► RUN BEFORE ONE’S HORSE TO MARKET to count the gain before the bargain is made → obs.
1605 ► AFFECT to assume; to make an ostentatious use or display of; to take upon oneself artificially or for effect; to assume 
1643 ► SUBSUME to assume; to infer → obs.
1905 ► TAKE ON to assume; to feign, to pretend; to act as a hypocrite → Eng. dial. (Bk.)