Intensive (adjective) — مُكثّف وقوي: Concentrated and requiring a lot of effort in a short time. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Intensely focused — or, of a liquid, dense and undiluted. An adjective: a concentrated mind, a concentrated sample. Not the verb concentrate, not the noun…
requiring much effort, skill, or attention; insisting upon exact conformity to requirements; making difficult requests or requiring high standards
Strong, healthy and full of energy.
Covering every detail; complete and thorough.
thoroughrigorousin-depthfocused
Performed with maximum intensity, effort, and resources; complete and unrestrained in execution.