If you are incompetent, you are not able to complete a task, like if you only ever made peanut butter and jelly sandwiches — you would be incompetent in the kitchen of a fancy French restaurant.
Someone who is not very good at getting a job done is incompetent. An incompetent salesperson can't sell anything. A learned professor may be quite incompetent when it comes to controlling a room full of rowdy pre-schoolers. Legally speaking, you can be declared incompetent if you do not have necessary qualifications, like being certified or licensed to do a certain job, like cut hair or fix cars.
adj not qualified or suited for a purpose
generally incompetent and ineffectual
lacking the ability or skill to perform effectively; inadequate
not characteristic of or suitable for a good workman
not producing desired results; wasteful
not meeting the proper standards and requirements and training
not having or showing or requiring special skill or proficiency
properly or sufficiently qualified or capable or efficient
(usually followed by `of') having capacity or ability
have the skills and qualifications to do things well
able to accomplish a purpose; functioning effectively
worthy of a good workman
being effective without wasting time or effort or expense
meeting the proper standards and requirements and training for an office or position or task
having or showing or requiring special skill
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