Was heißt »untauglich« auf Englisch?

Das Adjektiv »untauglich« lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Tausende völlig gesunder Windhunde werden jedes Jahr eingeschläfert, wenn sie für Rennen als untauglich erachtet werden.: Thousands of perfectly healthy greyhounds, which have been found unsuitable for racing, are euthanased every year.
Dieses Wörterbuch ist untauglich.: This dictionary is no good.

inadäquat:: inadequate; inappropriate
inkompetent:: incompetent
nutzlos:: futile; useless
unangebracht:: inappropriate
unangemessen:: improper; inadequate; inadequately; inappropriate; incommensurate; incommensurately; inopportune; undue; unrealistically; unreasonable; unsuitable
unbrauchbar:: useless
unfähig:: incapable; incompetent; unable
ungeeignet:: improper; inapplicable; inappropriate; inapt; inept; unapt; uneligible; unqualified; unsuitable
ungünstig:: inconvenient; unfavourable
unpassend:: improper; inconvenient
unwirksam:: ineffective
widrig:: adverse

Tom says he feels really unfit.
He was unfit to plead.
Tom is unfit to be a teacher.
Tom is unfit for the job.
In Hans Christian Andersen's classic fairy tale, "The Emperor's New Clothes," two swindlers promise an emperor beautiful new clothes that are invisible to anyone who is unfit for their position, unjust or stupid.
She's unfit for the job.
The state can take your children away if they deem you an unfit mother.
Tom is unfit for that job.
He is unfit to be a teacher.