in no uncertain terms
Definitely, clearly; bluntly, forthrightly; explicitly, categorically, unequivocally.
The latter held up the lamp where it wouldn't get smashed and admonished them in no uncertain terms that he wanted me alive.
adj
Not certain; unsure.
Conſider man without the protection and conduct of a ſuperior Being, and he is ſecure of nothing that he enjoys in this world, and uncertain of every thing that he hopes for.
Not known for certain; questionable.
Tomorrow's weather is uncertain.
Not yet determined; undecided.
Variable and subject to change.
Fitful or unsteady.
Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.