A straight path.
Straightforward, not evasive, candid and direct.
The witness was considered eminently credible thanks to her forthright answers.
Frank, outspoken.
Markedly simple.
Fixed, settled, decided.
Proceeding straight forth.
Expressly, frankly, unhesitatingly.
At once, forthwith.
Swiftly.
Straight forward, in a straight direction.