| อณู | aL nuuM | noun, formal, loanword, Pali | particle |
 อด  | ohtL | verb | abstain from food; to abstain; to fast |
อดกลั้น | ohtL glanF | verb, transitive, intransitive, phrase | to restrain (e.g. one's anger); tolerate; be patient; suppress; endure; bear |
| อดข้าวอดน้ำ | ohtL khaaoF ohtL naahmH | verb | [is] starving |
| อดโซ | ohtL sohM | attributive verb | [is] famished; starving |
| อดตาย | ohtL dtaayM | verb | starve to death |
| อดตาหลับขับตานอน | ohtL dtaaM lapL khapL dtaaM naawnM | verb, intransitive, phrase, colloquial, idiom | to go without sleep; to be burning the midnight oil |
| อดทน | ohtL thohnM | verb | to tolerate; endure; stand; put up with; bear |
| อดทน | ohtL thohnM | adjective | patient; able to endure; last; bear; stand; tolerate; put up with |
| อดนอน | ohtL naawnM | verb | not sleep a wink; abstain from sleeping |
| อดเปรี้ยวไว้กินหวาน | ohtL bpriaaoF waiH ginM waanR | example sentence, idiom | "He that eats the hard shall eat the ripe." |
| อดสู | ohtL suuR | verb, transitive, intransitive, formal | to feel ashamed |
| อดอยาก | ohtL yaakL | attributive verb | [is] starving |
| อดอยากปากแห้ง | ohtL yaakL bpaakL haaengF | attributive verb | [is] starving; famished; short of food |
| อดอาหาร | ohtL aaM haanR | verb | starve |
| อดัม | aL damM | proper noun, person | Adam [an English male given name] |
| อดิ | aL diL | adjective, particle, formal, loanword, Pali | [form of อติ] [prefix meaning] excellent; special; plentiful; extreme |
| อดิเรก | aL diL raehkF | noun | hobby |
| adjective | superior; supreme; abundant; plentiful; ample; extra; additional |
| อดีต | aL deetL | noun | the past; times gone by; former |
| อดีตกาล | aL deetL gaanM | noun, phrase, formal, loanword, Pali | [Thai grammar] the Past Tense |
| อดีตสมัย | aL deetL saL maiR | noun | the past; bygone times |
| อดีตอันตราตรึง | aL deetL anM dtraaM dtreungM | noun, phrase, poetic | the lingering past firmly imprinted in the mind |
| อติ | aL dtiL | adjective, particle, formal, loanword, Pali | [prefix meaning] excellent; special; plentiful; extreme |
| อติพจน์ | aL dtiL phoht[n]H | noun, phrase, formal, loanword, Pali | hyperbole |
| อธิ | aL thiH | adjective, formal, loanword, Pali | [a Pali-Sanskrit prefix meaning] superior; eminent; great; extreme; over; beyond |
| อธิกสุรทิน | aL thikH gaL sooL raH thinM | noun | the day added to February in a leap year |
| อธิการ | aL thiH gaanM | noun | abbot; director; headmaster |
| noun | [พระอธิการ] rector; head clergyperson |
| noun, loanword, Pali, Sanskrit | power; authority; jurisdiction; right |
| อธิฐาน | aL thiH thaanR | | [alternate spelling of อธิษฐาน] |
| อธิบดี | aL thipH deeM | noun | director-general; chief official |
| อธิบาย | aL thiH baayM | verb | explain; define; describe |
| อธิบายให้ชัดเจน | aL thiH baayM haiF chatH jaehnM | verb | to define |
| อธิพจน์ | aL thiH phoht[n]H | noun, phrase, formal, loanword, Pali | [variant of อติพจน์] |
| อธิษฐาน | aL thitH thaanR | verb, intransitive, formal, loanword, Sanskrit | to pray; to make a wish; to make a formal offering; to petition |
| noun, formal, loanword, Sanskrit | prayer; vow; determination |
| อน | aL naH | adjective, particle, formal, loanword, Pali | [the prefixes] "un-"; "in-"; "non-"; [the suffix] "-less" |
| noun, formal, loanword, Pali | breath; inhalation; inspired breath; inhaled air |
| verb, formal, loanword, Pali | to breathe; to inhale; to move |
| อนรรฆ | ohnM raH rohkH | adjective | priceless; very valuable |
| อนันต์ | aL nan[d]M | adjective, phrase, formal, loanword, Pali | countless; boundless; endless; infinite; everlasting; perpetual; incalculable [see Notes] |
| อนันต | aL nanM dtaL | | [alternate spelling of อนันต์] |
| อนันตชัย | aL nanM dtaL chaiM | proper noun, person, phrase, formal, loanword, Pali | Anantachai [a Thai male given name] |
| อนาคต | aL naaM khohtH | | the future |
| อนาคตกาล | aL naaM khohtH gaanM | noun, phrase, formal, loanword, Pali | [Thai grammar] the Future Tense |
| อนาจาร | aL naaM jaanM | noun | an obscenity, a lewd or shameful act |
| attributive verb | [is] lewd; obscene; immoral |
| noun | [การอนาจาร] [general] obscenity; indecency |
| อนาถ | aL naatL | verb, transitive, intransitive, formal, loanword, Pali | to feel pity; to be pitiful |
| adjective, formal, loanword, Pali | destitute; wretched; friendless; pathetic |
| adjective, formal, loanword, Pali | having no support |
| อนาถา | aL naaM thaaR | adjective, Pali, Sanskrit | destitute; impoverished; pauperized; homeless |
| อนาทร | aL naaM thaawnM | attributive verb | [is] concerned; caring |
| อนาธิปไตย | aL naaM thipH dtaiM | noun, phrase, formal, loanword, Pali | anarchy |
| อนาธิปัตย์ | aL naaM thiH bpat[y]L | noun | anarchy |
| อนามัย | aL naaM maiM | adjective | sanitary |
| noun | health; hygiene |
| noun | [การอนามัย] sanitation |
| อนิจจตา | aL nitH jaL dtaaM | | impermanence |
| อนิจจัง | aL nitH jangM | adjective | transient; unstable; not lasting; impermanent |
| interjection | "Alas!" |
| อนิจจา | aL nitH jaaM | interjection, formal | Alas! |
