adjective:

• insufficient; not enough; lacking Antonym: 足りる
• dim-witted; slow; one brick short of a full load

~たる adjective / ~と adverb:

• boundlessly wide or vast
• dim and indistinct

adverb / ~する noun:

• unfashionable; lacking style - onomatopoeia
• dim-witted; slow - onomatopoeia

godan ~る verb / intransitive verb:

• to smoke (e.g. fire); to billow smoke; to smoulder; to smolder
• to be hazy; to look dim

~たる adjective / ~と adverb:

• dense (e.g. fog, dust, etc.); thick
• vague (as in being unable to think clearly); dim

noun:

• Zen monk's early morning meal; refreshment; cakes
• simple Chinese food; dim sum