Exacting
Part of speech: verb
Definition: To demand and enforce the payment or performance of, sometimes in a forcible or imperious way.
Part of speech: adjective
Definition: Making excessive demands; hard to satisfy. Requiring precise accuracy
Stern
Part of speech: adjective
Definition: having a hardness and severity of nature or mannergrim and forbidding in appearance
Part of speech: noun
Definition: The rear part or after end of a ship or vessel.