The late Jerry Cesak (Jeff and Jer) once said, “Sincerity is everything, and when you learn to fake that, you have it made.” It sounds flippant at first, but there’s a lot of truth in that line.
There’s a moment that every radio personality who has done endorsements has experienced. You’re in the middle of an ad for a client, and you’re not particularly excited about it. Everything is fine. Your delivery is professional. You’re hitting the points, maintaining the pace, keeping the energy up. By any objective measure, you’re doing your job competently.
And somewhere in the middle of it, you realize it doesn’t sound right. The enthusiasm is slightly manufactured, the story is slightly constructed, and the whole thing is more performance than a relatable connection.
If you know, your audience knows. Not consciously. Not in a way they could articulate or point to. But somewhere in the part of the brain that has been processing human communication since before language existed, the part that detects micro-expressions, reads vocal tone, and evaluates trustworthiness in fractions of a second, it registers.
The gap between sincerity and forced sincerity is not as small as most personalities realize
Insincerity Sounds Like This
Most personalities, if asked whether their endorsements sound sincere, would say yes. They mean it. They’ve done the prep, know the copy, and want the client to get results. They have great intentions. They also want the money.
But intending to sound sincere and sounding sincere are not the same thing.
Insincerity in an endorsement doesn’t usually announce itself dramatically. It doesn’t sound like obvious lying or transparent performance. It’s a subtle collection of small signals that individually mean nothing but collectively communicate something the audience absorbs without being able to name.
Genuine excitement builds, peaks, and carries the energy of discovery or memory. Manufactured enthusiasm tends to be flat. It’s steady, professional, and consistent, but doesn’t have the same impact.
Here are some signs you may need a sincerity check:
Polished: Sincere endorsements sound the way real people talk about things they love. If your ads sound too polished and rehearsed, they may come across as lacking sincerity. Real people, talking about things they love, use incomplete sentences. They pause to search for the right word. They say, “it’s just — I don’t know, there’s something about it” because the experience is hard to articulate. Endorsement copy that’s been written and rewritten until it’s perfectly smooth doesn’t sound like that. It sounds written.
Non-Specific: Sincere recommendations tell you exactly why you should use it. “The food is incredible, and the service is always amazing” is a specific claim delivered in generic language. It could describe any restaurant and therefore describes none of them. But locking in on a detail makes it come alive:
“I don’t know what the chef does to the carbonara…he won’t tell me. But it’s not like any other carbonara. You can’t even describe it. You have to experience it, but be warned. It will ruin you for other carbonara.”
This detailed description oozes sincerity because it can only come from firsthand experience.
Comfortable: Endorsement ads should never get too comfortable. There should be a subtle story arc as the relationship develops, and that’s hard. If you’ve done an endorsement for the same client for eight months, it should sound like someone who’s been going to the same restaurant for eight months, not one you just discovered. Your delivery should evolve toward greater familiarity, warmth, and the accumulated background of an ongoing relationship. When the delivery sounds the same in month eight as it did in week one, you may be on autopilot, and that gets in the way of sincere performances.
