Final answer:
The word 'profound' is an adjective that means having deep meaning. Another form of the word is 'profoundness,' which is a noun that refers to the state of being profound.
Step-by-step explanation:
Profound is an adjective that means having deep meaning or significance. In sentence 78, it would be used to describe something that is very meaningful or impactful. For example, a sentence could be: 'The speaker's words had a profound effect on the audience.'
Another form of the word 'profound' is the noun 'profoundness.' It is a noun that refers to the state of being profound. An example sentence using 'profoundness' could be: 'The profoundness of the poem moved the readers.'