unable
UK: ʌnˈeɪb(ə)l | US: ʌnˈeɪb(ə)l
adj. lacking the skill, means, or opportunity to do something
adj. not capable of being achieved or accomplished
The word "unable" combines the Old English prefix "un-" (meaning "not") with the adjective "able" (derived from Latin "habilis," meaning "capable"). The prefix "un-" has been used in English since the early medieval period to negate words, while "able" entered Middle English via Old French, retaining its core sense of capability. Together, they form a straightforward negation of ability, reflecting a logical and consistent evolution in meaning.
She was unable to attend the meeting due to illness.
The team was unable to complete the project on time.
Without proper tools, he felt unable to fix the machine.
The small boat was unable to withstand the storm.
Despite his efforts, he remained unable to solve the puzzle.