tobann

Irish

Alteration of earlier obann, from Middle Irish opund (“quick, sudden”).^[2] Cognate with Scottish Gaelic obann.

tobann (genitive singular masculine tobainn, genitive singular feminine tobainne, plural tobanna, comparative tobainne)

sudden, unexpected
hasty, quick
precipitate (with a hasty impulse), rash, snap (done quickly and unexpectedly), abrupt (without notice)
impetuous (making arbitrary decisions), impulsive (actuated by impulse or transient feelings)
irascible, quick-tempered, short-tempered

Declension of tobann

Positive	Masculine	Feminine	(strong noun)	(weak noun)
	Singular		Plural (m/f)
Nominative	tobann	thobann	tobanna; thobanna²
Vocative	thobainn	thobann	tobanna
Genitive	thobainn	tobainne	tobanna	tobann
Dative	tobann; thobann¹	thobann; thobainn (archaic)	tobanna; thobanna²
Comparative	níos tobainne
Superlative	is tobainne

¹ When the preceding noun is lenited and governed by the definite article.
² When the preceding noun ends in a slender consonant.

Irish mutation
Radical	Lenition	Eclipsis
tobann	thobann	dtobann
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

^ “tobann”, in Historical Irish Corpus, 1600–1926, Royal Irish Academy
^ Gregory Toner, Sharon Arbuthnot, Máire Ní Mhaonaigh, Marie-Luise Theuerkauf, Dagmar Wodtko, editors (2019), “opunn”, in eDIL: Electronic Dictionary of the Irish Language
^ Quiggin, E. C. (1906) A Dialect of Donegal, Cambridge University Press, § 129, page 50