Here are some synonyms for "thoroughly":
* Completely
* Entirely
* Fully
* Absolutely
* Totally
* In every way
* With great care
* Meticulously
* Exhaustively
Here are some examples of how "thoroughly" can be used:
* "I thoroughly enjoyed the movie." (meaning I liked it a lot)
* "The room was thoroughly cleaned." (meaning it was cleaned very well)
* "He thoroughly investigated the case." (meaning he investigated it carefully and completely)
Essentially, "thoroughly" implies a level of intensity and completeness that goes beyond simply doing something. It suggests a thoroughness and dedication to the task at hand.