Sibylisation or syllables on Sibyl on her birthday

Adorable, unsinkable, she's massively capable.
Endorsable, unanalyseable, commonsensible,
She's Sibyl

Enviable, reas'nable, incredible and mem'rable.
Indispensable, irrepressible, embarrassable,
She's Sibyl

Affable, endorsable, indeed quite unsurpassable.
Valuable, knowledgeable and always responsible.
She's Sibyl

Accessible and teasable so very esteemable.
Charitable, amiable, bankable, believable,
She's Sibyl

Amusable, clubbable, commendable and equable,
Credible, dependable and quite irreprehensible,
She's Sibyl

I scribble “Great Sibyl”
She's civil, she's Sibyl,
No quibble, she's Sibyl,
No drivel, she's Sibyl!
She's Sibyl, great Sibyl,
So say ishkabibble,
Great Sibyl.