(w)

(gū) lone; lonely

孤傲 (w)

(gūào) proud and aloof

孤僻 (w)

(gūpì) antisocial; reclusive; eccentric

孤儿 (w)

(gūér) orphan

孤儿药 (w)

(gūéryào) orphan drug

孤儿院 (w)

(gūéryuàn) orphanage; child asylum

孤单 (w)

(gūdān) lone; lonely; loneliness

孤孀 (w)

(gūshuāng) widow

孤孑 (w)

(gūjié) lonesome; solitary

孤孑特立 (w)

(gūjiétèlì) to be all alone in the world

孤寂 (w)

(gūjì) lonesome; desolate

孤寒 (w)

(gūhán) alone and poor; humble; (Cantonese) miserly

孤寡 (w)

(gūguǎ) orphans and widows; to be lonely; loneliness

孤岛 (w)

(gūdǎo) isolated region

孤征 (w)

(gūzhēng) to act on one's own; to fight alone

孤拐 (w)

(gūguǎi) cheekbone; ankle

孤拔 (w)

(gūbá) Amédée Courbet (1826-1885), a French admiral who won a series of important land and naval victories during the Tonkin campaign and the Sino-French War

孤掌难鸣 (w)

(gūzhǎngnánmíng) It's hard to clap with only one hand.; It takes two to tango; It's difficult to achieve anything without support.

孤注一掷 (w)

(gūzhùyīzhì) to stake all on one throw

孤独 (w)

(gūdú) lonely; solitary

孤独无援 (w)

(gūdúwúyuán) lonely and isolated (idiom)

孤立 (w)

(gūlì) isolate; isolated

孤立子 (w)

(gūlìzǐ) soliton (physics)

孤立子波 (w)

(gūlìzǐbō) instanton (math.)

孤立无援 (w)

(gūlìwúyuán) isolated and without help

孤老 (w)

(gūlǎo) solitary old man or woman; regular patron (at brothels)

孤胆 (w)

(gūdǎn) solitary hero; maverick

孤胆英雄 (w)

(gūdǎnyīngxióng) solitary hero; maverick

孤芳自赏 (w)

(gūfāngzìshǎng) lone flower admiring itself (idiom); narcissism; self-love

孤苦零丁 (w)

(gūkǔlíngdīng) solitary and impoverished (idiom)

孤证不立 (w)

(gūzhèngbùlì) unacceptable as uncorroborated evidence (in law or in textual criticism)

孤负 (w)

(gūfù) variant of 辜負|辜负[gu1 fu4]

孤身只影 (w)

(gūshēnzhīyǐng) lit. a lonely body with only a shadow for company; to be all alone (idiom)

孤陋 (w)

(gūlòu) ignorant; ill-informed

孤陋寡闻 (w)

(gūlòuguǎwén) ignorant and inexperienced; ill-informed and narrow-minded

孤雌生殖 (w)

(gūcíshēngzhí) parthenogenesis (biol. a female reproducing without fertilization)

孤零零 (w)

(gūlínglíng) lone; isolated and without help; all alone; solitary

孤高 (w)

(gūgāo) arrogant

孤魂 (w)

(gūhún) lonely soul

孤鸟 (w)

(gūniǎo) lone bird; marginalized (country, person etc)