unextendible

At full stretch

Not capable of being extended or lengthened.

An unextendible deadline cannot be pushed back.

In mathematics and logic, an unextendible sequence or structure has reached its maximum possible size or completeness—nothing further can be added to it.

Also spelled *unextensible*.

fixed

immutable

Incapable of being changed

settled · final · conclusive · definite · absolute · unalterable · irrevocable · locked · set · established

rigid

inflexible

Unable to bend

inelastic · unadaptable · resistant · hardened · firm · strict · uncompromising · obstinate · intransigent · adamant

bounded

limited

Restricted in extent

maxed · confined · restricted · contained · enclosed · circumscribed · delimited · demarcated · terminable · exhaustible

Opposites
capacity for extension or expansion

unextendibleextendible

Able to lengthen

extensible · extendable · expandable · stretchable · elastic

Family

extend, extends, extended, extending, extender, extenders, extensible, extension, extensions

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