imprudent, impolitic, rash, stupid, ill-advised, improper, unadvisable, inexpedient.
It had been thought inadvisable
for me to be seen that morning anywhere in the neighbourhood of the Rue Daunou, but that perfidious reptile Theodore ran no risks in doing what he was told.
It was a short poem, but an earnest one: Truth is mighty and must prevail, Otherwise it were inadvisable
to tell the tale.
It was inadvisable
to go outside the inner circle where there was no material necessity for so doing.