The word "gentle" originates from the early 13th century Middle English gentil, meaning "high-born, noble, or of good family".  Derived from Old French gentil ("well-born" or "noble") and Latin gentilis ("of the same family or clan"), it shares roots with gentile, genteel, and gentry, evolving from a class descriptor into the modern definition of mildness or kindness by the 1550s.  

According to the Oxford English Dictionary (OED), the word gentle (as an adjective) was first used in English during the Middle English period (1150-1500), specifically appearing in the early 13th century (c. 1225 or earlier).  Earliest use as a verb Mid-1500s (recorded in 1532 in Usk's Testament of Loue).  Related Early Terms: Gentlewoman (c. 1225), gentleman (1222), and gentlery (before 1275) appear in the OED records from similar periods. 

"Gentle" in storytelling refers to a narrative style that prioritizes quiet, observational, and emotionally resonant moments over high-octane drama, violence, or constant conflict. It is important because it offers a space of safety, reflection, and deep empathy for the reader, acting as a "soft," often therapeutic, counterpoint to a loud, chaotic world. 

The Importance of Gentleness in Storytelling: 
Creates Lasting Emotional Resonance: Gentle stories often leave the longest-lasting impression. While loud, dramatic stories may excite initially but fade, gentle stories linger in memory through subtle, poignant moments rather than forced action. 
Allows for Deep Empathy and Reflection: By slowing down and focusing on the internal lives of characters, these stories encourage readers to explore complex emotions, empathy, and personal, quiet moments without the pressure of a fast-paced plot. 
Provides a "Safe Space": In an often overwhelming world, gentle, "soft" stories offer readers a sense of peace, comfort, and, in some cases, a respite from violence or over-stimulation. 
Fosters Connection over Judgment: Gentle, "quiet" writing focuses on understanding characters rather than judging them, a technique that often leads to a more profound, relatable human connection.
Invites Interpretation: These stories rarely spell out every detail, leaving room for readers to reflect, interpret, and fill in the gaps with their own experiences, making the experience more personal and intimate. 
Highlights the Power of Ordinary Moments: Gentleness in writing shines a light on the beauty of daily life—a cup of tea, a conversation, a quiet scene—proving that quiet, unheroic moments can be deeply significant and transformative. 

Just the facts:

GENTLE Definition & Meaning - Merriam-Webster

GENTLE Synonyms: 360 Similar and Opposite Words | Merriam-Webster Thesaurus

GENTLENESS Definition & Meaning - Merriam-Webster