断然的英文：
assertively
decisively
firmly
flatly
make no bones about
peremptoriness

参考例句：

absolute;unqualified
绝对的;断然的;直截了当的

However, he finally took the plunge.
不过他到最后还是断然决定试一试。

Disaffection often leads to outright treason.
政治上的不满常常导致断然的背叛。

He had finally taken the plunge and quitted the job.
最后他还是断然决定放弃那份工作。

Their disappearance or appearance is not everywhere strictly contemporaneous.
它们的出现或消失，不会在任何一个地方都断然属于同一时代。

Their disappearance or appearance is not everywhere strictly contemporaneous.
它们的出现或消失，不会在任何一个地方都断然属于同一时代。

His inexorable resolution
他断然的决心

The man categorically denied that he was guilty.
这人断然否认他有罪。

He stoutly denied his guilt.
他断然否认自己有罪。

Well, the answer is an unequivocal and emphatic "Yes!"
回答是毫不含糊和断然的两个字：能够。

assertively是什么意思：
ad. 断然;独断地

This is an assertive sentence.
这是一个论断句。

He has not a vestige of evidence for this assertion.
他没有丝毫证据证明这个论断。

She asserted the charge to be incorrect.
她声称这个命令是不正确的。

decisively是什么意思：
ad. 决然地;断然

Encouraged by the spirit of the spider, Bruce decied to try again.
受到那蜘蛛精神的鼓舞(鼓励),Bruce决定再试一次.

Such is their decision.
他们的决定就是这样。

A court decision.
判定，判决法庭决议，裁决

firmly是什么意思：
adv. 坚固地；稳固地；坚定地；坚决地

Grasp the thistle firmly
毅然处理困难局面

The struts are firmly braced.
那些支柱上得很牢固。

The tables are firmly fixed to the floor.
这些桌子被牢牢地固定在地上。