Insensation
(the idea is to notice the first letter of ech line, in case you're too brainless to figure it out yourself) :-)

In fire--------------Inflammation
Not nice--------------Inhumation
Secrets--------------Information
Explanation----------Illustration
Not just once--------Inclination
Strange idea-Transubstantiation
Algebra----------------Inequation
Trivial-Like-----------Indignation
Imbuing---------------Inspiration
Odoration------------Infestation
No-good poem-------Insensation
Jkc