1. sparingly= using or doing only a little of something

2. discursive= discussing many different ideas, facts etc,

without always having a clear purpose a long, discursive article

—discursively adverb

3. contingent= depending on something that may happen in the future

SYN dependent

contingent on/upon 

e.g. Further investment is contingent upon the company’s profit performance.

4. sophisticated=

01 having a lot of experience of life, and good judgment about socially important things such as art, fashion etc

02 a sophisticated machine, system, method etc is very well designed and very advanced, and often works in a complicated way

03 having a lot of knowledge and experience of difficult or complicated subjects and therefore able to understand them well

—sophistication /səˌfɪstɪˈkeɪʃən/ noun [uncountable]