Speak and write with confidence.

To help you avoid using the same word too repetitively, redundantly, recurrently, incessantly, etc., etc.

Why synonyms can be useful

Your writing can sound boring if you continually keep repeating the same words. When you create sentences, you can make them more interesting by using words that mean the same as the word you are speaking about. This allows you to add flavor to your writing.

In order to make language a lot more expressive and interesting you should try to vary the words you use as often as you can.

Synonyms for (adjective) subterraneous

Synonyms: ulterior, subterranean, subterraneous Definition: lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) Usage: subterranean motives for murder; looked too closely for an ulterior purpose in all knowledge- Bertrand Russell

Hypernyms: covert Definition: secret or hidden; not openly practiced or engaged in or shown or avowed Usage: covert actions by the CIA; covert funding for the rebels

Synonyms: subterranean, subterraneous Definition: being or operating under the surface of the earth Usage: subterranean passages; a subsurface flow of water

Hypernyms: subsurface Definition: beneath the surface Usage: subsurface materials of the moon