stiffest >> stɪf
Definition: [adjective] not easily bent or changed in shape; rigid.
Example: a stiff black collar
Definition: [adjective] severe or strong.
Example: they face stiff fines and a possible jail sentence
Definition: [adjective] full of.
Example: the place is stiff with alarm systems
Definition: [adjective] having a specified unpleasant feeling to an extreme extent.
Example: she was scared stiff