"assumptive" in the adjective sense
1. assumptive, assuming, presumptuous
excessively forward
"an assumptive person"
"on a subject like this it would be too assuming for me to decide"
"the duchess would not put up with presumptuous servants"
2. assumptive
accepted as real or true without proof
"the assumed reason for his absence"
"assumptive beliefs"
Source: WordNet® (An amazing lexical database of English)
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