Definitions for "Unreasonable"
To present participles which come from intransitive verbs, or are themselves employed as adjectives, to mark the absence of the activity, disposition, or condition implied by the participle;
Not reasonable; irrational; immoderate; exorbitant.
not reasonable; not showing good judgment
beyond normal limits; "excessive charges"; "a book of inordinate length"; "his dress stops just short of undue elegance"; "unreasonable demands"
in terms of search and seizure, the term means to have no grounds to conduct a search.