He was ____ in his pledge to complete the project on time and under budget.

what word: implacable, disgruntle, or illusory?

What do you think?

not illusory

would it be implacable?

Yes. Implacable is the best word.

To determine the correct word to complete the sentence, let's analyze the options:

1. Implacable: This word means unable to be appeased or satisfied. It doesn't fit the context of the sentence, as there is no indication of a lasting hatred or dissatisfaction in the situation described.

2. Disgruntle: This word means to make someone displeased or discontented. While it is closer in meaning to the intended context, it does not properly convey a commitment to completing the project on time and under budget.

3. Illusory: This word means based on an illusion; not real. Similar to "implacable," it doesn't fit the intended meaning of the sentence.

Now, let's examine the sentence again:

"He was ____ in his pledge to complete the project on time and under budget."

Given the options provided, the word that best fits the context of someone exhibiting commitment and determination to complete the project on time and under budget is "implacable." Therefore, the correct word to complete the sentence is "implacable."