extemporal

Adjective

Meaning

Extemporaneous; unpremeditated.

Source: Webster's dictionary

Synonyms

automatic informal spontaneous accidental conditional casual improvised ad hoc makeshift careless impromptu offhand adventitious extemporaneous extempore
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Antonyms

considered written intended planned prepared studied
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Close letter words and terms

extelligence extemp extemper extemporally extemporanea extemporanean