"developing a tendency" is a correct and usable phrase in written English.
You can use this phrase to describe a specific behavior or pattern that is developing or becoming more common over time. It is often used to discuss changes or shifts in someone's actions or habits. Example: As she continued to work long hours and skip meals, she was developing a tendency towards burnout.
The family homesteaded near Palmdale when Wayne was 7, then a small, gangly youngster, who was a bit shy with his peers, and already developing a tendency toward becoming something of a loner — as well as the private conviction that "big boys don't cry".
However, developing a tendency to regularly tabulate costs and benefits is a precarious relationship context compared to devoting attention to shared resources, goals, and values as this can lessen commitment to the relationship (e.g., Aron & Aron, 1997; Stafford & Canary, 2006).
She developed a tendency to refer to herself in the third person.
The long-toothed matinee idol – that lesser-spotted showbusiness queen Keiran O'Nightley – has developed a tendency to shun the world.
Under the new rule, it appears that chief executives of smaller companies developed a tendency to take option profits shortly before their stocks declined.
In some cases, original habitats were in present-day wintering areas, and animals developed a tendency to leave in spring in order to breed in other territories.
(Last year, Rove wrote a fan letter to a junior academic who had published a book pointing out that during the Civil War the Republican Party developed a "tendency to conflate Republicanism with loyalty and Democracy with treason").
Generally buoyant, Mr. McDermott has developed a tendency to note in rather mournful tones that Mr. Bradley is "a very serious guy who'd make a great president" and then begin reminiscing about Walter Mondale.
Mitt's sister Jane told Swidey that the dog developed a tendency to wander, and that she took Seamus to her home in California where there was more space.
A leading Chinese official who met him in December 2009, the most recent face-to-face encounter recorded in the cables, reported that as a result of his worsening health Kim had developed a tendency to "reverse policies", and that "officials also chart their own course as different factions competing for Kim's attention, making it difficult for Kim to set a firm, clear direction".
But with online video and the lure of branded content, some have developed a tendency to pitch individual videos or a series of videos to advertisers.
