unusably

Not fit for purpose

In a way that makes something impossible to use effectively.

Software might run unusably slow, a keyboard might be unusably sticky, or a room might be unusably cramped.

The word emphasizes that something fails to meet the minimum threshold for practical function: The app was unusably buggy at launch.

defective

faulty

Having defects or errors

flawed · imperfect · substandard · deficient · dysfunctional · nonfunctional · cracked · corrupted · glitchy · buggy

ineffective

impotent

Lacking power or efficacy

incapable · futile · unproductive · fruitless · nonfunctional · inoperative · unworkable · unsuccessful · feeble · diluted

impractical

cumbersome

Awkwardly heavy or bulky

inefficient · unmanageable · unworkable · inconvenient · impracticable · unfeasible · awkward · convoluted · labyrinthine · counterintuitive

inaccessible

unreachable

Cannot be accessed

restricted · incompatible · encrypted · paywalled · gatekept · offline · disconnected · unreadable · garbled · scrambled

frustrating

exasperating

Intensely irritating

irritating · maddening · vexing · troublesome · impossible · unresponsive · laggy · stuttering · freezing · crashing

Opposites
functionality/usability

unusablyusably

In serviceable fashion

functionally · serviceably · usefully · workably · operationally

Family

unusable

Familiarity
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Profile
Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G