The adjective hypothetical means something based on possible ideas or situations rather than actual ones.
Synonyms are guessed, assumed, theoretical, or speculative.
The word origins from Middle French frugalité (14th century). It also origins from Latin frugalitatem meaning “thriftiness, temperance, frugality”, and frugalis.
It is best for me to focus on practicalities than hypothetical possibilities.
Her question is hypothetical and not necessary.
Their assumption is purely hypothetical.