INFALLIBLY

[adverb] [not gradable]They acted their parts infallibly.The solid hydrogen will infallibly explode if it even warms up slightly.Diesel cars start infallibly, run without stalling when cold, and demand far less gear-changing than most petrol models.Infallibly also means always.He is infallibly cheerful despite his difficulties.Whenever we sit down to eat someone infallibly phones.