Weak
Part of speech: adjective
Definition: Lacking in force or ability. Dilute, lacking in taste or potency. Regular in inflection, especially of verbs. One of the four fundamental forces associated with nuclear decay. Bad or uncool. Good or cool ( we had a weak time ) slang in P.E.I., Canada.
Example sentence: The chains of habit are too weak to be felt until they are too strong to be broken.
Infirm
Part of speech: verb
Definition: To contradict, to provide proof that something is not.
Part of speech: adjective
Definition: Weak or ill, not in good health.