てっきり...と思う => surely; certainly; without a doubt N3
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
とでもいうべき => It must be said, it can be said N1
For example, simile
きらい => Hate... N5
Ability
むき => facing towards N3
Direction
すき => to like... N5
Ability
~きわみ => the utmost N1
Limit, limit
... ときく => I heard N2
Speculation
~むきがある(~向きがある)     => There is a tendency N1
きり => only; just; since; after ~ N2
に...ができる => complete N4
Completed
ときとして => sometimes... N2
Trend