Denshi Jisho — Online Japanese dictionary

曠野 あらの wasteland; wilderness; deserted land; prairie; vast plain; wilds; desert; wild land
Irregular kanji usage, Noun 
曠古 こうこ historic; unprecedented
Noun, No-adjective 
曠野 こうや wasteland; wilderness; deserted land; prairie; vast plain; wilds; desert; wild land
Irregular kanji usage, Noun 
曠原 こうげん wide plain or field
Noun 
曠々 こうこう extensive; spacious
Taru-adjective, Adverb taking the 'to' particle, Archaism 
曠曠 こうこう extensive; spacious
Taru-adjective, Adverb taking the 'to' particle, Archaism 
曠世 こうせい unparalleled; unparallelled; matchless
Noun, No-adjective 
曠然 こうぜん wide open (as in land); vast
Taru-adjective, Adverb taking the 'to' particle 
空しい むなしい vacant; futile; vain; void; empty; ineffective; lifeless
Common word, Adjective 
虚しい むなしい vacant; futile; vain; void; empty; ineffective; lifeless
Adjective 
曠職 こうしょく neglect of official duty
Noun 
空しい名声 むなしいめいせい empty name
Noun 
虚しい名声 むなしいめいせい empty name
Noun 

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