A paediatric surgeon had difficulty putting on a gown and surgical gloves and incorrectly filled out a medical form for a child with cancer, a Medical Council inquiry has heard.
Dr Mihai Anton, who was working at Our Lady's Hospital in Crumlin, used "monosyllabic answers" to converse with colleagues due to his limited language capability.
And on one occasion a colleague had to use hand gestures to explain how to administer medication, it is claimed.
Dr Anton, who was notified of the fitness to practise inquiry, failed to attend the first day.
The surgeon, who is from Romania, is facing 14 allegations of professional misconduct, or poor professional performance.
It is claimed his command of the English language was so poor that he was unable to order tests for a child as he did not understand what was being asked of him.
Dr Suzanne McMahon told the hearing he [Dr Anton] had great difficulty understanding simple instructions, forcing her to "demonstrate with actions".
She had to explain which "route" to administer medication - either through the vein or orally - by "pointing at my arm, and at my open mouth".
She recalled an occasion when a search was being carried out in the hospital as they "couldn't find" Dr Anton.
He was eventually found in a room in the day surgery unit with a young patient and their family.
Dr McMahon said there was a "big sign" outside the room which read "Don't use, contaminated" or "Requires cleaning".
After entering the room she saw what appeared to be vomit on the floor.
On another occasion, Dr Anton took it upon himself to attempt to process a "consent form" for a child with a recurrence of Hodgkin's disease.
Consent forms outline what the operation entails and a list of possible complications before it is signed by a legal guardian to give clearance for the procedure to take place.
However, he filled out the form incorrectly, transcribing the patient's operation on the line where the consultant's name is supposed to be written.
Dr Anton applied in late 2012 to work at Crumlin Hospital. He submitted a CV, which said he had qualified as a consultant in Romania.
He supplied references and was appointed on January 14 last year. He had been recruited to work as a surgical senior house officer (SHO) but was suspended with full pay 10 days later. His contract was terminated in March last year.
In correspondence, Dr Anton claimed he felt harassed and would never return to this country. The hearing continues.