unable

If you are like this, you cannot do something.

• I am unable to help.
• He was unable to walk after the accident.
• We have been unable to contact her.

How to use it: unable to do something (She was unable to open the door.)

Similar words: incapable

Opposites: able

Common phrases: unable to attend, unable to work, unable to help

Used over a radio to say that you cannot follow an instruction.

• “Unable,” the pilot replied.
• “Unable at present; our engine is overheating.”
• “Unable due to low fuel; request another runway.”

Common phrases: unable due to, unable at present