0 sudden and unexpected, and often unpleasant: --
1 using too few words when talking, in a way that seems rude and unfriendly: --
2 sudden and not expected, often with unpleasant results: --
3 not friendly or polite; showing little interest in talking to other people: --
His abrupt manner makes me uncomfortable.
As might be expected, these forces decrease as the temperature falls, with abrupt changes occurring at phase transitions.
Though multiple states could be achieved, transitions were abrupt and predictable.
Not only was the formal apparatus radically new, but there was an even more abrupt break with the traditional principles of fundamental physics.
The plants need to shed their leaves in response to abrupt environmental change.
Often, there is a gradational transition in luminescence from weak to stronger, followed by an abrupt return to weak luminescence.
Subsequent abrupt deepening led to deposition of a thick black shale unit, turbidite deposits and large-scale submarine channel-fill deposits.
A thin conglomerate and abrupt facies change between the members mark this contact.
The circulatory changes that result in functional closure of the foramen are sudden and abrupt, occurring within the first few minutes after birth.
