Lab – A large amount of something
Laidhricín – Little finger, pinkie
Lagar – Weakness, fainting, fainting fit
Laghdaigh – Reduce
Lách - Pleasant, friendly Láiche
Ba láidre – Strongest
Laimpín – Lamp
Lámh – Hand, arm
Las – Light Lasadh – Lighting Lasta – Lit Lastaí Ar lasadh – On fire
Leaba – Bed Leapa
Leabhar – Book Leabhra (Plural)
Leabharlann – Library
Leac – Flat stone or rock, slab
Leacóg – Small flat stone
Leadaí – A layabout, a good for nothing person
Leadaíocht – Laziness, idleness
Leagan amach – Lay out, arrange
Leanbh – Young child
Leath – Half
Leathcheann – Half-wit
Leathan – Wide
Leathbhliain – Six months
Leathchéad – Fifty
Leathchos – One-legged
Leathlá - Half-day
Leathspleic – Half grin
Leathuair – Half an hour
Leaticó – A rascal
Leicneach - Mumps
Léim – Jump, leap, bound Léimnigh
Léimneach – Jumping, leaping, bounding
Leisciúil – Lazy
Leithéid - Like, the like of
Leithscéal – Excuse
Leor Go leor – Enough
Liathgorm – Pale blue
Liathróid – Ball
Ligh – Lick
Líne – Line
Liobar – Blubber lip
Líobra - Big, flabby person
Litir – Letter Litreacha (Plural)
Liúch – Yelling, shouting
Loch – Lake
Lóch - light seaweed
Ba lú – Smallest
Luach – Value
Luaith – Ash
Luan – Monday
Lúchóg – Mouse
Lucht – People
Luigán - a rotten part of a potato
Lupar - A fledgling
Luparán - a small bird