austere

As adjectives the difference between rigid and austere

is that rigid is stiff, rather than flexible while austere is grim or severe in manner or appearance.

As adjectives the difference between austere and unornamented

is that austere is grim or severe in manner or appearance while unornamented is not ornamented; without ornament.

Unproductive is a related term of austere.

As adjectives the difference between unproductive and austere

is that unproductive is not productive; useless; fruitless while austere is austere.

Austere is a related term of obstinate.

As adjectives the difference between austere and obstinate

is that austere is austere while obstinate is stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent.

As adjectives the difference between austere and gossamer

is that austere is austere while gossamer is tenuous, light, filmy or delicate.

As a noun gossamer is

a fine film or strand as of cobwebs, floating in the air or caught on bushes etc.

As adjectives the difference between acerbic and austere

is that acerbic is tasting sour or bitter while austere is grim or severe in manner or appearance.

Austere is a related term of inexorable.

As adjectives the difference between austere and inexorable

is that austere is austere while inexorable is unable to be persuaded; relentless; unrelenting.

Formal is a related term of austere.

As a noun formal

is an objective.

As an adjective austere is

austere.

As adjectives the difference between distant and austere

is that distant is far off (physically, logically or mentally) while austere is grim or severe in manner or appearance.

As adjectives the difference between barren and austere

is that barren is unable to bear children; sterile while austere is grim or severe in manner or appearance.

As a noun barren

is an area of low fertility and habitation, a desolate place.