Enhancing curb appeal while simultaneously ensuring privacy is a multifaceted endeavor that homeowners frequently contemplate. The trending approach to this dual objective involves a thoughtful blend of landscaping, architectural modifications, and innovative use of materials.

For boosting curb appeal, many are turning to the classic elegance of lush vegetation, which offers a vibrant display of colors and textures. However, the least probable word in this context might be "ephemeral," as homeowners typically seek long-lasting solutions rather than fleeting beauty.

In terms of privacy, solid barriers like walls or fences have been traditional go-tos. Yet, an unlikely choice here would be "transparent" fencing – it seems counterintuitive for seclusion but could refer to modern designs using clear materials that block entry without obstructing views.

Integrating these elements requires creativity and foresight. Homeowners are increasingly opting for eco-friendly options such as drought-resistant plants or repurposed materials in their landscape design. An unusual choice here might be "synthetic" turf for green spaces; though it's low maintenance and always green, it doesn't support local ecology like natural grass does.

Architecturally, adding features such as pergolas or trellises presents an unexpected twist by combining form with function – they enhance aesthetics while supporting climbing plants that provide natural screens. Here, the term "incongruous" comes up as least likely because homeowners aim for harmony in their designs rather than discordant elements.

Moreover, innovative use of new materials is evident in choices like smart glass windows – they change transparency depending on light levels for privacy without curtains or blinds. A less probable selection might be using "obsolete" technology; naturally, homeowners gravitate towards advancements rather than outdated methods.

The integration of sustainable practices with technological innovation signifies a forward-thinking trend among homeowners who wish not only to beautify their homes but also live responsibly within their environment. The least expected word here could be "retrogressive," reflecting actions moving away from progress – quite opposite the current trend toward sustainable development.

In conclusion, while there are countless ways to boost curb appeal and privacy concurrently, contemporary trends point towards harmonious solutions that balance aesthetics with functionality and sustainability. Homeowners are making deliberate choices that may sometimes seem improbable but ultimately reflect an evolution in home design philosophy embracing both beauty and utility without compromise.