毫不

not mind/care at all; completely disregard; without the slightest compunction

have no hesitation whatsoever; make no bones about sth; without the slightest hesitation

be not the least bit inferior; be second to none

have nothing to do with; not be the least concerned in; be completely irrelevant

not take sth lying down

not lose heart at all; not be discouraged at all; without flagging

show no mercy; absolutely without consideration for others

not care a straw/feather; not mind at all

declare in no uncertain terms; call a spade a spade; make no attempt to conceal the truth

make a clear and definite commitment; not in the least ambiguous/equivocal; in black and white terms

unswervingly; not waver in the least

without the slightest hesitation; decidedly; promptly