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The key role of marine macroalgae is enormous in marine ecosystems and maintains the biodiversity's structure. Many of them encompass therapeutic and commercial phytochemicals and attain economic significance. Ulva is a notable and environmentally tolerant species with rapid growth in the short term. It is highly nutritious and has been consumed in the human diet in various forms for long decades. However, most of the species under this genus have never been detailed for their biological properties. Therefore, this present endeavour is subjected to the profiling of Ulva profunda. The present study deals with identifying features, proximate analysis, preliminary qualitative phytochemical analysis, GC-MS analysis, antimicrobial activity, antioxidant activity, and anticancer activity of this species. This species is rich in ash (14.39±0.54%), moisture (4.91±2.69%), fat (1.66±0.03), and carbohydrates (76.7±3.79). The preliminary qualitative screening of this species confirms the presence of secondary metabolites such as alkaloids, saponins, tannins, flavonoids, steroids, glycosides, terpenoids, phenols, quinones, and anthraquinones. The GC-MS analysis endorses the presence of 17 compounds with various important activities. The ethanolic extract of this species expressed significant activities against the pathogen Pseudomonas syringae (17.66±0.33 mm) in 50 μg/ml concentration. Similarly, the ethanolic extract of this species showed excellent radical scavenging activity (32.63 ± 1.5 μg/ml). Furthermore, it has a moderated cytotoxic effect (48.37 ± 1.6 μg/ml) against A459 human lung cells. These outcomes open up interesting prospects for this species to be utilized. [ABSTRACT FROM AUTHOR]